South Carolina Cosmetology Practice Exam 2025 – 400 Free Practice Questions to Pass the Exam

Question: 1 / 400

What is the primary ingredient in most hair dyes?

Aminophenol

Hydrogen peroxide

Para-phenylenediamine (PPD)

The primary ingredient in most hair dyes is para-phenylenediamine (PPD). This compound serves as a key dye intermediate in a wide range of hair coloring products. PPD is favored for its effectiveness in creating long-lasting and vibrant hair colors. It engages in a chemical reaction with other components in the dye formula to develop the desired shades.

Additionally, while hydrogen peroxide acts as a catalyst in the hair coloring process by facilitating the color development and ammonia helps to open the hair cuticle for better penetration, these substances are used in conjunction with PPD rather than being the primary coloring agent. Aminophenol, meanwhile, is also a dye intermediate but is less commonly the primary ingredient in commercial formulations compared to PPD. Understanding the role of these ingredients helps in recognizing their importance in the chemistry of hair dyes.

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Ammonia

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