INCI name

CI 42051

CI 42051 (blue colorant)

Colorantreviewed

A blue colorant, also known as Patent Blue V.

What it is

CI 42051 is a synthetic blue dye (Patent Blue V). It is listed in Annex IV of the EU Cosmetics Regulation (allowed colorants).

Where it is used

Shampoos, shower gels, mouthwashes and toothpastes.

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.

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 60Ethanaminium, N-(4-((4-(diethylamino)phenyl)(5-hydroxy-2,4-disulfophenyl)methylene)-2,5-cyclohexadien-1-ylidene)-N-ethylhydroxide, inner salt, calcium salt (2:1) and its insoluble barium, strontium and zirconium lakes, salts and pigments
Conditions and warnings
Purity criteria as set out in Commission Directive 95/45/EC (E 131)
As of
3 November 2026 · (EC) 2009/1223
EU · Annex II, entry 1356Ethanaminium, N-(4-((4-diethylamino)phenyl)(5-hydroxy-2,4-disulfophenyl)methylene)-2,5-cyclohexadien-1-ylidene)-N-ethyl-, hydroxide, inner salt, calcium salt (2:1) (Acid Blue 3; CI 42051) when used as a substance in hair dye products
As of
3 November 2026 · (EC) 2013/344

Products with this ingredient (147)

Check a full ingredient list