Massachusetts Barber Practice Exam 2025 - Free Barber License Practice Questions and Study Guide

The main ingredient in most hair color products is indeed ammonia or peroxide, as these ingredients play critical roles in the hair coloring process. Ammonia is used to open the hair cuticle, allowing the color to penetrate the hair shaft. This is essential for achieving a long-lasting and vibrant color result. On the other hand, hydrogen peroxide serves as an oxidizing agent that activates the dye and helps to lighten the natural pigment in the hair, enabling a broader range of color options.

Hydrogen peroxide is important in this context, but it is primarily used in conjunction with ammonia during the coloring process, hence the choice that includes both ingredients reflects their combined importance. Other ingredients like alcohol and glycerin may be present in various formulations for purposes like preservation or conditioning, but they are not the primary agents responsible for the hair coloring effect. Therefore, the inclusion of both ammonia and peroxide as a combined option accurately represents the essential components typically found in hair color products.