Washington Cosmetology License Practice Exam

What is the primary function of a developer in hair coloring?

1. To condition the hair

2. To add shine to the hair

3. To activate the color

4. To wash out previous colors

The correct answer is: To activate the color

The primary function of a developer in hair coloring is to activate the color. Developers contain hydrogen peroxide, which is a key ingredient in hair dye formulations. When mixed with the color product, the developer initiates a chemical reaction that allows the color to penetrate the hair shaft. This process not only helps to lift the natural pigment but also facilitates the deposit of the new color, ensuring that the hair absorbs it properly. Choosing a developer with the appropriate volume (such as 10, 20, 30, or 40) is crucial, as it determines the level of lift and the intensity of the color that can be achieved. Therefore, understanding the role of the developer in color application is essential for creating the desired hair color results. In contrast, conditioning agents in hair color formulations serve to nourish and protect the hair during the coloring process, while shine enhancers may be included to improve the overall appearance of the hair post-coloring. Washing out previous colors is a separate procedure entirely and does not involve the function of a developer. Understanding these distinctions is fundamental for successful hair coloring practices.