Shine Bright on the South Carolina Barber Exam 2026 – Snip, Style, and Succeed!

Para-phenylenediamine (PPD) is widely recognized as a common allergen found in hair dye products. It is a chemical compound often used in permanent hair dyes due to its ability to create a wide range of colors. However, PPD can cause allergic reactions in certain individuals, ranging from mild skin irritation to severe dermatitis. Because of its prevalence and potential to elicit allergic responses, it is crucial for professionals and clients to be aware of its presence in hair coloring products.

While ammonia, hydrogen peroxide, and alcohol are commonly used in hair dye formulations, they do not carry the same level of allergenic potential as PPD. Ammonia primarily acts as a hair cuticle opener to allow dye to penetrate the hair shaft, hydrogen peroxide is used as a bleaching agent, and alcohol serves various purposes such as solvent and preservative. However, these substances are less frequently associated with allergic reactions compared to PPD, which is why it is essential to conduct patch tests before applying hair dye containing this compound.