A predisposition skin patch test is required for products containing which type of ingredient?

• A. Water
• B. Fragrances
• C. Aniline derivative ingredient
• D. Coloring agents

Answer: (C)

A patch test is used to identify if someone may have an allergic reaction to certain ingredients before they are exposed to a product. In cosmetic color products, the ingredients most likely to trigger sensitization are aniline derivatives, such as p-phenylenediamine, which are common in hair dyes. These compounds are well-known strong sensitizers, so a predisposition patch test helps detect any allergy to them, preventing a potentially severe skin reaction when the product is used. Water is inert and unlikely to cause a reaction, and while fragrances can cause allergies, the test in this context is specifically aimed at the aniline derivative coloring agents due to their high risk of sensitization. Coloring agents cover a broad category, but the risk that necessitates testing is tied to these aniline-derived colorants.