ACID BLUE 9
ACID BLUE 9 is permitted in cosmetics in the EU with restrictions — Annex III, entry 190 of Regulation (EC) No 1223/2009. Review the conditions of use, permitted concentration and Safety Gate alerts.
Regulatory data checked on 2026-09-05. The legal status follows Regulation (EC) No 1223/2009 and its annexes; the substance is identified from the European Commission's CosIng database.
About the ingredient
Dihydrogen (ethyl)[4-[4-[ethyl(3-sulphonatobenzyl)]amino]-2'-sulphonatobenzhydrylidene]cyclohexa-2,5-dien-1-ylidene](3-sulphonatobenzyl)ammonium, disodium salt (CI 42090)
EU regulatory status
Annex of Regulation (EC) No 1223/2009: III/190
What entry III/190 of the Regulation says
Benzenemethanaminium, N-ethyl-N-[4-[[4-[ethyl-[(3-sulfophenyl)-methyl]-amino]-phenyl](2-sulfophenyl)methylene]-2,5-cyclohexadien-1-ylidene]-3-sulfo, inner salts, disodium salt and its ammonium and aluminium salts (15); Acid Blue Acid Blue 9 Ammonium salt; CI 42090. (see note 17)
Source: the European Commission's official CosIng database and Regulation (EC) No 1223/2009 of the European Parliament and of the Council on cosmetic products. How we assess ingredients — full methodology.
- View the entry in the CosIng database (European Commission)
- Open Regulation 1223/2009 in EUR-Lex
- Check the chemical profile in PubChem
Last updated:
Functions in cosmetics
Frequently asked questions
Is ACID BLUE 9 safe in cosmetics?
ACID BLUE 9 is permitted in cosmetics in the EU, but subject to the conditions set out in Regulation (EC) No 1223/2009 — typically a maximum concentration, product category or a mandatory warning on the packaging. Manufacturers must comply with these limits.
In which annex of Regulation 1223/2009 does ACID BLUE 9 fall?
ACID BLUE 9 falls under reference III/190 in the annexes of Regulation (EC) No 1223/2009 on cosmetic products. An annex entry may name a substance directly or cover it as part of a broader category. The first part (Roman numeral) indicates the annex: II – prohibited substances, III – substances restricted by conditions, IV – permitted colorants, V – permitted preservatives, VI – permitted UV filters.
What functions does ACID BLUE 9 perform in cosmetics?
According to the European Commission's CosIng database, ACID BLUE 9 performs the following functions in cosmetics: HAIR DYEING. Functions are defined in the CosIng glossary and describe the technological role of a substance in the finished product.
Are there Safety Gate alerts concerning ACID BLUE 9?
We found 1 recent alerts in the EU Safety Gate database in which ACID BLUE 9 appears in the risk description or on the ingredient list of a recalled cosmetic. The full list and details of each alert are below in the Safety Gate alerts section.
Safety Gate alerts mentioning this ingredient
We found 1 recent EU Safety Gate alerts that mention ACID BLUE 9 in the hazard description or ingredient list.