A synthetic triphenylmethane colorant listed in Annex IV and linked to an Annex II entry.
What it is
CI 42045 is a synthetic sulfonated colorant that CosIng classes chemically as a triphenylmethane colour. CosIng lists it as a colorant. In the EU it is listed in Annex IV (colorants), with an entry that excludes products applied on mucous membranes, and the EU data also link it to an entry in Annex II (prohibited substances).
Where it is used
Found in a small number of products.
Limits of interpretation
The INCI list shows which ingredients are present, not how much of each. Above 1%, ingredients are listed in descending order of weight; below 1% the order is free.
See the EU regulation section for the applicable conditions and for what the Annex II entry covers and how it applies.
Functions
- Colorant
- Exclusively or mainly intended to colour the cosmetic product, the body as a whole or certain parts thereof, by absorption or reflection of visible light; (precursors of oxidative hair colorants shall be deemed colorants). All authorised colorants are substances in the positive list of Annex IV to the Cosmetics Regulation 1223/2009.
EU regulation
EU · Annex IV, entry 59Ammonium, (4-(alpha-(p-(diethylamino)phenyl)-2,4-disulfobenzylidene)-2,5-cyclohexadien-1-ylidene)diethyl-, hydroxide, monosodium salt
- Maximum concentration
- Not to be used in products applied on mucous membranes
- As of
- 3 November 2026 · (EC) 2009/1223
EU · Annex II, entry 1355Ethanaminium, N-(4-((4-diethylamino)phenyl)(2,4-disulfophenyl)methylene)-2,5-cyclohexadien-1-ylidene)-N-ethyl-, hydroxide, inner salt, sodium salt (Acid Blue 1; CI 42045) when used as a substance in hair dye products
- As of
- 3 November 2026 · (EC) 2013/344