New York State Cosmetology Practice Exam 2025 - Free Cosmetology Practice Questions and Study Guide

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Which ingredient is commonly found in hair color products?

Hydrogen peroxide

Hydrogen peroxide is a common ingredient in hair color products primarily because it acts as a developer. Its main function is to open the hair cuticles to allow the dye to penetrate the hair shaft effectively and to activate the color. When used in conjunction with hair dye, hydrogen peroxide helps in the oxidation process, which is crucial for the dyes to develop and achieve the desired color result.

In contrast, vinegar, sugar, and salt do not play significant roles in the chemistry of hair coloring. Vinegar is more often associated with hair rinses for conditioning benefits rather than color application, while sugar and salt are typically used in culinary contexts or for therapeutic purposes, not in hair dye formulations. Therefore, hydrogen peroxide is essential in hair color products, serving its purpose as an oxidizing agent to achieve lasting color changes.

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Vinegar

Sugar

Salt

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