Acid Blue 9
A cosmetic ingredient used as hair dyeing in skincare, haircare, and personal-care products sold in the European Union.
What is it?
Dihydrogen (ethyl)[4-[4-[ethyl(3-sulphonatobenzyl)]amino]-2'-sulphonatobenzhydrylidene]cyclohexa-2,5-dien-1-ylidene](3-sulphonatobenzyl)ammonium, disodium salt (CI 42090)
What does it do?
Acid Blue 9 is listed in the EU cosmetic ingredient inventory with the following declared functions:
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Hair dyeing
colours hair, either by depositing pigment on the surface or by chemically altering the hair's natural pigment
EU regulatory status
This ingredient is restricted in the European Union.
Acid Blue 9 is listed under Annex III of EU Cosmetics Regulation 1223/2009 (entry 190). It is permitted only under specific conditions, concentration limits, or in particular product types.
Frequently asked questions
What is Acid Blue 9?
Acid Blue 9 is a cosmetic ingredient catalogued in the EU CosIng database. Dihydrogen (ethyl)[4-[4-[ethyl(3-sulphonatobenzyl)]amino]-2'-sulphonatobenzhydrylidene]cyclohexa-2,5-dien-1-ylidene](3-sulphonatobenzyl)ammonium, disodium salt (CI 42090)
Is Acid Blue 9 allowed in cosmetics in the EU?
Only with restrictions. Acid Blue 9 is permitted in EU cosmetics only under specific conditions defined in Annex III of Regulation 1223/2009.
What does Acid Blue 9 do in cosmetic products?
Acid Blue 9 is declared in the EU cosmetic ingredient inventory with these functions: hair dyeing.
What is the CAS number of Acid Blue 9?
The CAS (Chemical Abstracts Service) number for Acid Blue 9 is 3844-45-9.
Related ingredients
Source: EU CosIng database (European Commission). This page is derived from public-sector information published by the European Commission. · Last updated: 14/08/2020