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Basic Red 51

INCI: BASIC RED 51

Reviewed by Kate · Last updated 18 Aug 2026

What Is Basic Red 51?

Basic Red 51 (INCI: BASIC RED 51) is a cosmetic ingredient listed in the EU CosIng inventory. 2-[[4-(Dimethylamino)phenyl]azo]-1,3-dimethyl-1H-imidazolium chloride.

Its declared cosmetic function is hair dyeing.

Source: European Commission CosIng inventory.

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