CI 12010 is a chemical compound, a red synthetic dye also known as Solvent Red 3

Chemical name: 4-[(4-Ethoxyphenyl)azo]naphthol

What it is used for and where

Cosmetics

It’s an ingredient that makes the final product more aesthetically appealing, but can pose a potential risk to human health with unwanted side effects especially when used continuously as it can be absorbed by the skin or mucous membranes.

Safety

It’s an ingredient that has some important contraindication regarding the health profile: it must not come into contact with the mucous membranes. (Document 32009R1223. Regulation (EC) No 1223/2009 of the European Parliament and of the Council of 30 November 2009 on cosmetic products (recast) (Text with EEA relevance)

It’s an azo dye, a class of commercial organic dyes.

The problem related to azo dyes (monoazo or diazo) is photocatalytic degradation that leads to possible oxidation and subsequent formation of impurities such as aromatic amines some of which have carcinogenic activity. (Konstantinou, I. K., & Albanis, T. A. (2004). TiO2-assisted photocatalytic degradation of azo dyes in aqueous solution: kinetic and mechanistic investigations: a review. Applied Catalysis B: Environmental, 49(1), 1-14.)

Molecular Formula    C₁₈H₁₆N₂O₂

Molecular Weight    370.4 g/mol

CAS   6535-42-8

EC number 229-439-8

UNII XNW2E18207

DTXSID6064402

MFCD00009691

Synonyms: 

Fat Brown B

4-((4-Ethoxyphenyl)azo)-1-naphthalenol

Trade name BRUN FONCE AU GRAS W 8201