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HC Yellow No. 4 is a synthetic dye specifically used in hair coloring products. It imparts a yellow shade to the hair, often used in conjunction with other dyes to achieve desired tones.
May aggravate
Safety summary
Generally considered safe for use as a hair dye. Allergic reactions or skin irritation can occur in sensitive individuals, so a patch test before use is advised.
CAS Number
59820-43-8
For informational purposes only. This is not medical advice. Always patch test new products and consult a dermatologist for skin concerns.