South Dakota Cosmetology Practice Exam 2025 - Free Cosmetology Practice Questions and Study Guide

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Name one common ingredient in hair color that may cause allergic reactions.

Ammonia

Hydrogen peroxide

Paraphenylenediamine (PPD)

Paraphenylenediamine (PPD) is a common ingredient found in many hair color products, particularly in permanent dyes. It is known to be a significant allergen and can cause allergic reactions in some individuals. PPD helps create a long-lasting color by bonding to the hair shaft. However, its potential to provoke contact dermatitis and other allergic reactions makes it crucial for cosmetologists to conduct patch tests before applying hair color to assess a client’s sensitivity to this ingredient. This understanding is essential for ensuring client safety and satisfaction during hair coloring procedures.

While ammonia, hydrogen peroxide, and resorcinol have their own roles and potential irritations, it is PPD that is most notably recognized for its links to allergic reactions in a notable percentage of the population. This underscores the importance of awareness of ingredient safety in cosmetology practices.

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Resorcinol

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