NIC Cosmetology Written (Theory) ExamScientific ConceptsHard
A cosmetologist is preparing to apply a hair color product that contains hydrogen peroxide. The hydrogen peroxide acts as an oxidizing agent in the hair coloring process. What is the primary role of an oxidizing agent in this context?
- ATo reduce the pH of the hair
- BTo remove existing color pigments and develop new ones
- CTo break down the hair's keratin structure
- DTo seal the hair cuticle after coloring
Show answer & explanationAnswer & explanation
Correct answer: B. To remove existing color pigments and develop new ones
In hair coloring, an oxidizing agent (like hydrogen peroxide) serves two primary functions: it lightens the natural melanin by oxidizing it, and it helps to develop the artificial color molecules within the hair shaft by initiating an oxidation reaction that allows them to polymerize and become larger, permanent pigments.
Why the other options are wrong
- A. Oxidizing agents in hair color typically raise the pH (e.g., with ammonia) to open the cuticle, not reduce it.
- C. While strong oxidation can damage keratin, the primary role is not to break it down but to modify pigment.
- D. Sealing the cuticle is typically done with an acidic conditioner after coloring, not by the oxidizing agent itself.
Oxidizing Agent (Hair Color)
In hair coloring, an oxidizing agent (developer), typically hydrogen peroxide, is a chemical that facilitates the lightening of natural hair pigment and the development of artificial color molecules within the hair shaft.
- Usually hydrogen peroxide
- Lightens natural melanin
- Develops artificial color molecules
- Causes an oxidation reaction
- Required for permanent hair color
Memory trick: Oxidizing Opens Old color, Offers New color