Podcast
Questions and Answers
The 'Active' growth phase of hair is also known as which of the following?
The 'Active' growth phase of hair is also known as which of the following?
- Canities
- Telogen
- Anagen (correct)
- Catagen
What is the typical duration of the Anagen phase, also known as the active or primary phase, of hair follicle growth?
What is the typical duration of the Anagen phase, also known as the active or primary phase, of hair follicle growth?
- 2 - 4 years
- 2 - 6 years (correct)
- 4 - 6 years
- 1 - 2 years
Approximately how much does hair grow during the Anagen phase?
Approximately how much does hair grow during the Anagen phase?
- $1/2$ inch per month (correct)
- 1 inch per month
- $3/4$ inch per month
- $1/4$ inch per month
Which stage of hair growth is often referred to as the 'Transition Stage'?
Which stage of hair growth is often referred to as the 'Transition Stage'?
What is the average duration of the Catagen stage of hair growth?
What is the average duration of the Catagen stage of hair growth?
During which stage of hair growth is a 'Club Hair' formed?
During which stage of hair growth is a 'Club Hair' formed?
The formation of which type of hair signals the end of the Catagen stage of hair growth?
The formation of which type of hair signals the end of the Catagen stage of hair growth?
'Active' and 'Primary' are terms associated with which stage of the hair growth cycle?
'Active' and 'Primary' are terms associated with which stage of the hair growth cycle?
Which phase of the hair growth cycle is often referred to as the 'resting phase'?
Which phase of the hair growth cycle is often referred to as the 'resting phase'?
What event is signaled by the Catagen stage in the hair growth cycle?
What event is signaled by the Catagen stage in the hair growth cycle?
What is the approximate duration of the Telogen phase of hair follicle growth?
What is the approximate duration of the Telogen phase of hair follicle growth?
Which phase is generally known to be the longest in the hair follicle growth cycle?
Which phase is generally known to be the longest in the hair follicle growth cycle?
What percentage of hair, on average, is in the Anagen stage at any given time?
What percentage of hair, on average, is in the Anagen stage at any given time?
Which stage of hair growth cycle is most hair in at any given time for the average person?
Which stage of hair growth cycle is most hair in at any given time for the average person?
Which stage of hair growth is characterized by the slowing down of hair growth?
Which stage of hair growth is characterized by the slowing down of hair growth?
What is another common name for the Telogen stage?
What is another common name for the Telogen stage?
Approximately how much would you expect the hair of an average person to grow within 1 year?
Approximately how much would you expect the hair of an average person to grow within 1 year?
If a stylist is cutting a client's hair. And it requires a trim of the same length as 6 months prior, how much needs to be removed?
If a stylist is cutting a client's hair. And it requires a trim of the same length as 6 months prior, how much needs to be removed?
What is the term that defines shaving, as the cutting or removal of the hair the at the level of the skin?
What is the term that defines shaving, as the cutting or removal of the hair the at the level of the skin?
Short, fine, soft hair with pigment is best described by:
Short, fine, soft hair with pigment is best described by:
Short, fine, light colored/unpigmented hair, often observed on women and children is best described by:
Short, fine, light colored/unpigmented hair, often observed on women and children is best described by:
How does extremely curly hair tend to grow compared to the typical growth rate?
How does extremely curly hair tend to grow compared to the typical growth rate?
Short hairs, 1 to 2 centimeters in length, containing little or no pigment, are best described by:
Short hairs, 1 to 2 centimeters in length, containing little or no pigment, are best described by:
The term Canities is another term for what:
The term Canities is another term for what:
This short, fine, pigmented hair is often observed on premature babies:
This short, fine, pigmented hair is often observed on premature babies:
Normal wet hair can be stretched what percentage of its length without incurring damage?
Normal wet hair can be stretched what percentage of its length without incurring damage?
What aspect of hair does the follicle primarily determine?
What aspect of hair does the follicle primarily determine?
Which type of croquignole curl (roller set/curling iron) creates the least amount of movement in the hair?
Which type of croquignole curl (roller set/curling iron) creates the least amount of movement in the hair?
Which of the following is NOT considered a component of a pin curl?
Which of the following is NOT considered a component of a pin curl?
During finger waving, what is the likely result if the comb cannot penetrate the hair at the scalp?
During finger waving, what is the likely result if the comb cannot penetrate the hair at the scalp?
What is the MOST important factor in achieving a strong finger wave?
What is the MOST important factor in achieving a strong finger wave?
What term describes a hair set using alternating rows of pin curls and finger waves?
What term describes a hair set using alternating rows of pin curls and finger waves?
What effect does an 'On-Base' or 'No-Stem' placement have on the resulting hair style?
What effect does an 'On-Base' or 'No-Stem' placement have on the resulting hair style?
Which type of curl placement creates the GREATEST degree of movement or softness in a hairstyle?
Which type of curl placement creates the GREATEST degree of movement or softness in a hairstyle?
Which base shape is BEST suited for barrel curls?
Which base shape is BEST suited for barrel curls?
Which type of placement will create the LEAST degree of movement or softness?
Which type of placement will create the LEAST degree of movement or softness?
What is the effect of 'Off-Base' placement on the hair?
What is the effect of 'Off-Base' placement on the hair?
What styling effect is achieved when a roller is placed half off-base?
What styling effect is achieved when a roller is placed half off-base?
What is the recommended way to handle shears when pausing momentarily during a haircut?
What is the recommended way to handle shears when pausing momentarily during a haircut?
Which of the following describes the components of a pin curl?
Which of the following describes the components of a pin curl?
What is the effect of a 'no stem' pin-curl or an 'on base' roller set?
What is the effect of a 'no stem' pin-curl or an 'on base' roller set?
What type of curl should be used to create a tight, firm, long-lasting effect?
What type of curl should be used to create a tight, firm, long-lasting effect?
Which of the following statements is the MOST accurate?
Which of the following statements is the MOST accurate?
To produce a tight, long-lasting curl exactly on-base, what technique should be used?
To produce a tight, long-lasting curl exactly on-base, what technique should be used?
Which of the following curl placements creates the firmest curl with the strongest wave pattern?
Which of the following curl placements creates the firmest curl with the strongest wave pattern?
From what part of a pin-curl does it receive both its direction and mobility?
From what part of a pin-curl does it receive both its direction and mobility?
Which curl placement will result in the weakest or loosest wave pattern?
Which curl placement will result in the weakest or loosest wave pattern?
What type of curls or waves should a stylist use to create the greatest movement or mobility?
What type of curls or waves should a stylist use to create the greatest movement or mobility?
Which roller set technique would create a strong curl pattern, yet still allow for looseness in the finished style?
Which roller set technique would create a strong curl pattern, yet still allow for looseness in the finished style?
When the stem direction is towards the face, it is:
When the stem direction is towards the face, it is:
If a client requests a haircut to match a previous style from six months ago, and hair typically grows 1/2 inch per month, approximately how much hair should be cut?
If a client requests a haircut to match a previous style from six months ago, and hair typically grows 1/2 inch per month, approximately how much hair should be cut?
Which of the following terms accurately describes the removal of hair at the skin level, often achieved through shaving?
Which of the following terms accurately describes the removal of hair at the skin level, often achieved through shaving?
What type of hair is characterized as short, fine, and soft, typically containing pigment?
What type of hair is characterized as short, fine, and soft, typically containing pigment?
Which of the following accurately describes vellus hair?
Which of the following accurately describes vellus hair?
Compared to the typical rate, approximately how does extremely curly hair tend to grow?
Compared to the typical rate, approximately how does extremely curly hair tend to grow?
Which of the following describes hair that is 1 to 2 centimeters in length and contains little to no pigment?
Which of the following describes hair that is 1 to 2 centimeters in length and contains little to no pigment?
What hair condition is 'Canities' another term for?
What hair condition is 'Canities' another term for?
What type of hair is common to premature babies?
What type of hair is common to premature babies?
Without causing breakage, approximately what percentage can normal wet hair be stretched?
Without causing breakage, approximately what percentage can normal wet hair be stretched?
What primary characteristic of hair does the follicle determine?
What primary characteristic of hair does the follicle determine?
Which type of croquignole curl technique typically results in the LEAST amount of movement?
Which type of croquignole curl technique typically results in the LEAST amount of movement?
During finger waving, what is most likely the problem if the comb cannot penetrate the hair at the scalp?
During finger waving, what is most likely the problem if the comb cannot penetrate the hair at the scalp?
What factor is MOST crucial in achieving a strong finger wave?
What factor is MOST crucial in achieving a strong finger wave?
What is the term for a hair setting technique that uses alternating rows of pin curls and finger waves to achieve a specific style?
What is the term for a hair setting technique that uses alternating rows of pin curls and finger waves to achieve a specific style?
What affect does an 'on base' placement have on the resulting hair style?
What affect does an 'on base' placement have on the resulting hair style?
Which type of pin curl placement creates the GREATEST degree of movement?
Which type of pin curl placement creates the GREATEST degree of movement?
What styling effect results from placing a roller half off-base?
What styling effect results from placing a roller half off-base?
What is the recommended way to handle shears when pausing momentarily during a haircut to ensure safety and professionalism?
What is the recommended way to handle shears when pausing momentarily during a haircut to ensure safety and professionalism?
If a stylist aims to produce a tight, long-lasting curl directly on-base, which technique should they employ?
If a stylist aims to produce a tight, long-lasting curl directly on-base, which technique should they employ?
What type of hair is short, fine, and has pigment?
What type of hair is short, fine, and has pigment?
When cutting a client's hair in January, then cutting it again 6 months later to the same length, what length should be removed?
When cutting a client's hair in January, then cutting it again 6 months later to the same length, what length should be removed?
What is the term for cutting or removing hair at the level of the skin?
What is the term for cutting or removing hair at the level of the skin?
What BEST describes extremely curly hair growth?
What BEST describes extremely curly hair growth?
What hair presentation are you seeing, if you see short hairs from 1–2 centimeters with little or no pigment?
What hair presentation are you seeing, if you see short hairs from 1–2 centimeters with little or no pigment?
What common word is 'Canities' referring to?
What common word is 'Canities' referring to?
What is the percentage a normal strand of wet hair can be safely stretched?
What is the percentage a normal strand of wet hair can be safely stretched?
Which hair follicle feature MOST influences its overall characteristics?
Which hair follicle feature MOST influences its overall characteristics?
What type of croquignole curl creates the least amount of movement or volume?
What type of croquignole curl creates the least amount of movement or volume?
During finger waving, what will happen if the comb fails to move the hair at the scalp line?
During finger waving, what will happen if the comb fails to move the hair at the scalp line?
In finger waving, what aspect is MOST important for a strong wave pattern?
In finger waving, what aspect is MOST important for a strong wave pattern?
What is the term for a hair design with alternating rows of pin curls and finger waves?
What is the term for a hair design with alternating rows of pin curls and finger waves?
What is the effect on the hair when pin curls/rollers are placed "On-Base"?
What is the effect on the hair when pin curls/rollers are placed "On-Base"?
What type of curl placement creates the MOST movement and softness?
What type of curl placement creates the MOST movement and softness?
Which base is the BEST suited for barrel curls?
Which base is the BEST suited for barrel curls?
What effect does 'Off-Base' placement have on the hair?
What effect does 'Off-Base' placement have on the hair?
When pausing momentarily during a haircut, what is the recommended way to handle shears?
When pausing momentarily during a haircut, what is the recommended way to handle shears?
What are pin-curls made up of?
What are pin-curls made up of?
A 'no stem' pin-curl, or an 'on base' roller set, creates:
A 'no stem' pin-curl, or an 'on base' roller set, creates:
To create a tight, firm, long lasting curl, which should you use?
To create a tight, firm, long lasting curl, which should you use?
How to produce a strong curl pattern, but still allow looseness in the finished set?
How to produce a strong curl pattern, but still allow looseness in the finished set?
If the stem direction is going towards the client's face, it is referred to as:
If the stem direction is going towards the client's face, it is referred to as:
What hair type is defined as short, fine, and soft, typically possessing pigment?
What hair type is defined as short, fine, and soft, typically possessing pigment?
Which hair type is characterized by being short, fine, and light colored/unpigmented, commonly seen on women and children?
Which hair type is characterized by being short, fine, and light colored/unpigmented, commonly seen on women and children?
If a client's hair was cut in January, and they return six months later requesting the same length, approximately how much hair should be removed considering average hair growth?
If a client's hair was cut in January, and they return six months later requesting the same length, approximately how much hair should be removed considering average hair growth?
Compared to the rate of typical hair, what kind of growth pattern does extremely curly hair display?
Compared to the rate of typical hair, what kind of growth pattern does extremely curly hair display?
What condition is also referred to as 'Canities'?
What condition is also referred to as 'Canities'?
What type of hair is commonly observed on premature babies?
What type of hair is commonly observed on premature babies?
What is the approximate percentage that normal wet hair can be stretched without causing damage or breakage?
What is the approximate percentage that normal wet hair can be stretched without causing damage or breakage?
To achieve a soft wave pattern with high mobility in a curl or wave, which stem placement is MOST suitable?
To achieve a soft wave pattern with high mobility in a curl or wave, which stem placement is MOST suitable?
Which of the following curl placements yields the LEAST movement and the MOST volume?
Which of the following curl placements yields the LEAST movement and the MOST volume?
When pausing during a haircut, what is the recommended method for handling shears to ensure safety and professionalism?
When pausing during a haircut, what is the recommended method for handling shears to ensure safety and professionalism?
Which action is required to create tight, firm, long lasting curls?
Which action is required to create tight, firm, long lasting curls?
What does a 'no stem' pin-curl, or an 'on base' roller set create?
What does a 'no stem' pin-curl, or an 'on base' roller set create?
The component of a pin-curl that gives both direction and mobility is the:
The component of a pin-curl that gives both direction and mobility is the:
When a client wants both a perm and hair color, what is the typical order they should be performed in?
When a client wants both a perm and hair color, what is the typical order they should be performed in?
In hair coloring, what does it mean when you use the word 'Complimentary'?
In hair coloring, what does it mean when you use the word 'Complimentary'?
If a client's hair has been lightened to a pale yellow and they want to neutralize warmth, which toner base color should be applied?
If a client's hair has been lightened to a pale yellow and they want to neutralize warmth, which toner base color should be applied?
What strength of hydrogen peroxide would you use if you wanted NO lift, and deposit only?
What strength of hydrogen peroxide would you use if you wanted NO lift, and deposit only?
To achieve maximum lift in a one-process color application, which developer volume should generally be used?
To achieve maximum lift in a one-process color application, which developer volume should generally be used?
Approximately how long does a bleach mixture typically maintain its potency after mixing?
Approximately how long does a bleach mixture typically maintain its potency after mixing?
If a stylist wants to remove tint/artificial color, which product is recommended?
If a stylist wants to remove tint/artificial color, which product is recommended?
Which layer of the hair would contain the melanin?
Which layer of the hair would contain the melanin?
When white hair is discolored with yellow streaks, which of the following products will camouflage the unwanted color tone?
When white hair is discolored with yellow streaks, which of the following products will camouflage the unwanted color tone?
Which of the following does NOT belong to the family of Aniline derivative tints?
Which of the following does NOT belong to the family of Aniline derivative tints?
Flashcards
Anagen
Anagen
The 'active' growth phase of hair.
Anagen Phase Length
Anagen Phase Length
Approximate duration of the Anagen or active phase of hair follicle growth.
Catagen Stage
Catagen Stage
The Catagen stage of hair growth is known as the transition stage.
Catagen Stage Length
Catagen Stage Length
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Club Hair
Club Hair
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Resting phase
Resting phase
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Telogen Length
Telogen Length
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Anagen phase
Anagen phase
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Telogen Phase
Telogen Phase
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Catagen Stage signals
Catagen Stage signals
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Depilation
Depilation
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Lanugo
Lanugo
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Vellus
Vellus
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Canities
Canities
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Hair Follicle
Hair Follicle
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achieving a strong finger wave
achieving a strong finger wave
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Skip waves
Skip waves
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No stem
No stem
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Closed End
Closed End
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Splits
Splits
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40 volume
40 volume
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Acids
Acids
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Cortex area
Cortex area
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Violet
Violet
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Permanent color
Permanent color
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Hair Growth in Anagen
Hair Growth in Anagen
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Club hair formation
Club hair formation
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Most hair in which phase?
Most hair in which phase?
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Annual hair growth
Annual hair growth
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Wet hair stretch
Wet hair stretch
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Dry hair stretch
Dry hair stretch
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No stem curl
No stem curl
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Skip waves hair set
Skip waves hair set
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On-Base Placement
On-Base Placement
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Full stem placement
Full stem placement
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No stem placement
No stem placement
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Off-Base Placement
Off-Base Placement
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Pin-Curl Stem
Pin-Curl Stem
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On-Base
On-Base
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Full Stem
Full Stem
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Forward Movement
Forward Movement
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On base, no stem
On base, no stem
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Acid Wave
Acid Wave
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Triangular Bases
Triangular Bases
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Hair Breakage
Hair Breakage
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Telogen Stage is Also Known As
Telogen Stage is Also Known As
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Curly Hair Growth Rate
Curly Hair Growth Rate
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Lanugo Hair
Lanugo Hair
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Half Off-Base Roller
Half Off-Base Roller
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Handling shears
Handling shears
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Pin-curl component
Pin-curl component
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Hair percentage in anagen
Hair percentage in anagen
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Complimentary Colors
Complimentary Colors
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Law Of Color
Law Of Color
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Henna
Henna
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Which Comes First
Which Comes First
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Compact Cuticle
Compact Cuticle
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Most Soap is what?
Most Soap is what?
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Strand test
Strand test
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PH
PH
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Vellus Hair
Vellus Hair
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Dye Solvent
Dye Solvent
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Acid Rinse
Acid Rinse
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Shampoo pH
Shampoo pH
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Highlighting shampoo contains
Highlighting shampoo contains
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Scalp and virgin hair bleach
Scalp and virgin hair bleach
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Certified Colors and allergy
Certified Colors and allergy
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Dye removal
Dye removal
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Hair with Compact Cuticle Layer
Hair with Compact Cuticle Layer
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Blue and yellow makes
Blue and yellow makes
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Positive Predisposition Test
Positive Predisposition Test
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Oxidative containers
Oxidative containers
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Pre-Color Application
Pre-Color Application
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Active and Primary
Active and Primary
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Elevation
Elevation
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Melanin
Melanin
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Green
Green
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Coal Tar
Coal Tar
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Color One Shade Darker
Color One Shade Darker
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On base curls
On base curls
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Off base
Off base
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Heat from the scalp
Heat from the scalp
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Closes Cuticle
Closes Cuticle
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Blue
Blue
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Even width
Even width
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Study Notes
Hair Growth Phases
- The active or primary phase of hair follicle growth is Anagen, this lasts 2-6 years
- Hair grows approximately ½" inch per month during the Anagen phase
- The Catagen stage is also known as the Transition Phase of hair growth, this lasts about 2-3 weeks
- Club hair formation signals the end of the Catagen stage of hair growth
- Active and Primary both apply to the Anagen stage of the hair growth cycle
- The Telogen phase is also known as the Resting/dormant stage and lasts approximately 3 to 6 months
- An average person's hair is 90% in the Anagen phase
Hair in the Human Body
- The secondary stage of hair growth, where growth slows down is Catagen
- Dormant stage is also known as the Telogen phase
- The hair of an average person will grow 6 inches in one year
- Hair stretching up to 40%-50% of its length without damage or breakage is considered normal for wet hair
- The amount of stretch normal for dry hair without damage or breakage is 20%
- January to July (6 months) would require a 3" trim to maintain the same length
Types of Hair
- Short, fine, soft hair with pigment are Lanugo
- Short, fine, light colored or unpigmented hair, often observed on women and children is Vellus
- Short hairs, 1-2 centimeters in length, containing little to no pigment is also Vellus
- Short, fine, pigmented hair often observed on premature babies is Lungo
- Gray Hair is also known as Canities
- Extremely curly hair typically grows somewhat slower than ½" an inch per month.
Hair Properties
- The hair follicle determines, shape, size, and direction of growth of the hairs.
- Melanin is the coloring material of hair.
- Melanin can be found in the cortex layer of the hair shaft
- Hair with a hard, closed, or compact cuticle layer is resistant, and non-porous
- An open cuticle layer results in more porous hair
Hair Removal
- Shaving is considered an example of depilation
Hair Styling
- Using a croquignole curl results in the least amount of movement in the hair when set on no stem/on base roller
- A hair set using alternating rows of pin-curls & finger waves is referred to as Skip Waves
- "On-Base" or "No-Stem" placement on the hair results in more volume, less movement
- Full stem and off base placement achieves the greatest degree of movement or softness
- No stem / on Base" placement creates the least degree of movement or softness
- Off-Base placement results in less volume
- Half off-base placement creates medium volume
- The best comb placement is to be certain the hair at the scalp is moving
- Pin-curl is made of stem, base, and circle
- No stem pin-curls is synonymous with "on base" roller sets, creating tight, firm, long lasting curls
- For tight, long lasting curls, place your curl directly on-base using over direction
- For maximum volume, use an on base with no stem
- Full stem and off base makes the weakest and loosest wave pattern
- Use off base with full stem curls when the client seeks loose curls or waves with maximum movement or mobility
- Achieving a strong curl pattern with looseness in finished style requires half stem of half off base placement
- Stand up pin-curls are barrel curls
- A roller set parting should be the same size of the roller
- In a wet set, the least resulting volume would require an off base placement
- Combinations of pin-curls and finger waves are Skip waves
- Forward movement is when a stem direction is going towards the client's face
- In a roller-set, the hair/curl part closest to the head is called the closed end
Hair Color and Chemistry
- Oxidation occurs during the Neutralization period
- Reduction takes place during the Processing period
- For clients wanting both, perm is recommended before color
- Oxidation occurs when neutralizing a permanent wave
- The diameter of the rod in a perm determines the size of the curl
- A volumizing shampoo may increase porosity and hasten color fading
- In hair coloring "complimentary" means opposite colors
- Complimentary color for yellow is violet and complimentary color for red is green
- Opposite color to yellow is violet and opposite color to red is green
- A toner with a violet base is needed to remove warmth from hair lightened to pale yellow
- 5 volume hydrogen peroxide (H2O2) achieves NO Lift and deposits color only
- Bleach mixture potency lasts about 2 hours
- The coloring material of the hair is known as melanin
- Pastel shades are contained in toners
- A bluing rinse can be applied to camouflage yellow streaks in white hair
- A violet toner can be applied to correct yellow streaks on a client with white hair
- Aniline derivative tints are derived from coal tar
- Cream decolorization is not likely to require a predisposition test
- Twice as much H2O2 is often used with high lift colors for a tint, as aniline derivatives,
- Orange is not a part of the primary colors and blue is not a secondary color
- A client with orange hair can tone the orange with blue
- If 70%-80% of a client's hair is grey and they want it tinted to it's original color, choose one shade darker than the original color
- A stylist using blue based toner on pale yellow hair will result in green
- Aniline derivative tints belongs to the family of penetrating dyes
- When mixed equally, blue and yellow primary colors make green
- Henna on white or grey hair will react as orange
- A neutral/platinum blonde shade on a medium brown haired client lightened to the palest yellow is achieved with violet
- If you lighten to palest yellow and apply a blue based toner the result will be light green
- The law of color suggests you would use blue to darken a color
- Shortest to longest lasting, the order is temporary, semi-permanent, demi- permanent and permanent.
- In general, tinting with blue, green, and violet are classified as being cool colors or tones
- In general, tinting with red, orange, and yellow are classified as being warm colors or tones
- Pale, yellow blonde tones result from the coloring effects of chamomile on very light hair
- Permanent color offer the best coverage for maximum coverage when the client has 80 percent grey hair
- Stylists use a filler on bleached or highlighted hair to help even out its porosity
- Bleach and tone, in hair coloring, the expression "double process" refers to that
- Tint back is returning the color to its original shade, whether lighter or darker
- Dye solvent is used to remove artificial color from hair
- Oxidative tints are best mixed in glass/plastic
- A pre-softener is required for extremely resistant canities hair
- Paraphenylenediamine colors is for hair
- Alkaline is a characteristic of most soaps and shampoos
- Most "60 second" rinses will counteract the ph of most shampoos
- Closing the cuticle, increased shine, ridding soap/shampoo scum is achieved using mild acid such as vinegar
- Higher hair porosity has a greater and quicker effect on hair processing times
- Alkaline softens and swells the hair's cuticles
- An acid rinse is a bad choice just prior to applying temporary color
- 3% hydrogen peroxide strengths is deposit only
- Predisposition tests with negative results mean one can go ahead with the service, on the opposite, positive results mean one must refuse service
- Heat from the scalp speeds up the lightening process in reference to virgin and high lift coloring jobs.
- Dye solvents are used to remove old very dark tints
- Predisposition tests or strand tests have to be performed 24 - 48 hours in advance
- Certified colors do not carry the risk of needing Predisposition Tests
- Alkaline rinses have a softening and swelling effect on the hair
- Elevation is the proper use of degrees in hair cutting.
- Effilating or Slithering helps to remove bulk and creates mobility
- Professional lash and brow tints are not aniline derivative.
- Never formulate their clients hair using color that is lighter than them.
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