Podcast
Questions and Answers
What are the two main pigments responsible for the various hair colors?
What are the two main pigments responsible for the various hair colors?
- Phaeomelanins and eumelanin (correct)
- Eumelanin and pheomelatonin
- Pheomelanins and butomelanins
- Pheomelatonin and eumalonin
What does the higher amount of eumelanin in the hair generally result in?
What does the higher amount of eumelanin in the hair generally result in?
- Darker hair color (correct)
- Blond hair color
- Reddish hair color
- Lighter hair color
What is the key intermediate that reacts to produce either eumelanin or pheomelanin?
What is the key intermediate that reacts to produce either eumelanin or pheomelanin?
- DOPA
- Pigment granules
- Cysteine
- DOPAquinone (correct)
What does DOPAquinone react with to form pheomelanin?
What does DOPAquinone react with to form pheomelanin?
What factor contributes to the variety of colors produced in nature?
What factor contributes to the variety of colors produced in nature?
Which pigment is responsible for dark browns and blacks?
Which pigment is responsible for dark browns and blacks?
What is the primary function of the hair cuticle in the uptake and performance of dyes?
What is the primary function of the hair cuticle in the uptake and performance of dyes?
Which layer of the hair contains most of the hair pigment?
Which layer of the hair contains most of the hair pigment?
What is responsible for the perception of hair damage related to dyeing?
What is responsible for the perception of hair damage related to dyeing?
What happens to damaged fibres in terms of absorption of dyes?
What happens to damaged fibres in terms of absorption of dyes?
What is responsible for the differential wearing properties of dyes?
What is responsible for the differential wearing properties of dyes?
What increases the potential for diffusion of dyes into the hair fiber?
What increases the potential for diffusion of dyes into the hair fiber?
What factors determine the partition coefficient of the dye between the hair and the delivery system?
What factors determine the partition coefficient of the dye between the hair and the delivery system?
Why is it important to use a combination of organic, watermiscible solvent, and adjuvants in hair colorant formulation?
Why is it important to use a combination of organic, watermiscible solvent, and adjuvants in hair colorant formulation?
What should be favored in developing the delivery system for a hair colorant?
What should be favored in developing the delivery system for a hair colorant?
What is a desired outcome when formulating a hair colorant in terms of partition coefficient?
What is a desired outcome when formulating a hair colorant in terms of partition coefficient?
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