Questions and Answers
What is semi-permanent hair color?
Dye molecules sit on the outside of the hair and last 2-3 weeks without penetrating the cuticle.
What is demi-permanent hair color?
Dye molecules penetrate the cuticle without lifting and last 6-8 weeks.
What is permanent hair color?
Oxidative dyes that produce lift and displace melanin.
What are the three types of dyes commonly used in hair color products?
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What is oxidative dye?
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What is pre-oxidized dye?
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What is direct dye?
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Oxidative dyes normally have a ____ base and include either ___ or ___ in the formula.
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Why is an alkaline environment required in hair coloring?
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What are the two separate components of permanent hair colors?
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What is a primary color?
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List the primary colors.
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What is a secondary color?
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List the secondary colors.
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What is a tertiary color?
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List the tertiary colors.
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What do all primary colors mixed equally create?
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What does it mean to control or cancel dominant pigment?
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How do you control or cancel a dominant pigment?
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To cancel out yellow in hair, what are the two missing primary colors?
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What are the types of lighting in hair color?
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Incandescent light favors what kind of tones?
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What provides a warm reflection against hair and skin?
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Fluorescent light has a diffusing capacity that reduces ______ and spreads ______.
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Fluorescent lighting highlights what tones on hair and skin?
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Pure white/natural light gives what tones?
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Without light, there is no?
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Study Notes
Types of Hair Color Dyes
- Semi-permanent: Sits on the hair's surface, lasting 2-3 weeks without penetrating the cuticle.
- Demi-permanent: Penetrates the cuticle without lifting, lasting 6-8 weeks.
- Permanent: Involves oxidative dyes that lift and displace melanin in the hair.
Categories of Dyes
- Commonly used dyes include oxidative dyes, pre-oxidized dyes, and direct dyes.
Definitions of Dyes
- Oxidative Dyes: Colorless until mixed with hydrogen peroxide, they develop and deposit in the cortex, creating the final color result.
- Pre-oxidized Dyes: Semi to semi-permanent, partially oxidized dyes that require low-volume peroxide to complete the oxidation.
- Direct Dyes: Large pre-colored molecules that deposit between cuticle and cortex, needing no oxidation.
Chemical Composition
- Oxidative dyes typically have an alkaline base containing ammonia or ammonia replacements.
- An alkaline environment is necessary to swell the hair and open the cuticle layer, allowing oxygen liberation from hydrogen peroxide.
Permanent Coloring Components
- Permanent hair colors consist of two parts: dye precursors with ammonia in an alkaline base, and a stabilized hydrogen peroxide solution.
Color Theory
- Primary Colors: Colors that cannot be created, including red, yellow, and blue.
- Secondary Colors: Result from mixing two primary colors in equal parts, yielding orange, violet, and green.
- Tertiary Colors: Created from combining a primary and a secondary color, such as yellow-green and blue-violet.
Mixing Colors
- Equal mixing of primary colors results in a neutral color.
- To control or cancel dominant pigments, one should neutralize unwanted color results by moving across the PM color map.
- To eliminate yellow tones, red and blue are needed.
Lighting Types and Their Effects
- Incandescent Light: Favors warm tones and creates a warm reflection against hair and skin.
- Fluorescent Light: Diffuses light, reduces shadows, and highlights cool tones on hair and skin.
- Pure White/Natural Light: Provides the truest tones.
Importance of Light
- Light is essential for perceiving color; without it, color does not exist.
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Description
Test your knowledge on the various classifications of hair color. This quiz includes definitions and characteristics of semi-permanent, demi-permanent, and permanent dyes, aimed at helping you understand the differences. Ideal for cosmetology students and hair stylists.