What ingredient is hazardous in Revlon Color-Silk?

Revlon Color-Silk hair dye contains ammonia, which can be hazardous as it may cause irritation to the skin, eyes, and respiratory system. Additionally, some formulations may include other potentially harmful chemicals like para-phenylenediamine (PPD), which can trigger allergic reactions in sensitive individuals. It's important for users to conduct a patch test before use to assess any adverse reactions. Always follow safety guidelines provided with the product.