CI 12490 is a chemical compound, a red synthetic azo dye also known as Pigment Red 5

Chemical name: 

N-(5-chloro-2,4-dimethoxyphenyl)-4-[[5-(diethylsulfamoyl)-2-methoxyphenyl]diazenyl]-3-hydroxynaphthalene-2-carboxamide

What it is used for and where

Cosmetics

Restricted cosmetic ingredient as IV/14  a Relevant Item in the Annexes of the European Cosmetics Regulation 1223/2009. Substance or ingredient reported: N-(5-Chloro-2,4-dimethoxyphenyl)-4-[[5-[(diethylamino)sulphonyl]-2-methoxyphenyl]azo]-3-hydroxynaphthalene-2-carboxamide (Pigment Red 5; CI 12490) and its salts when used as a substance in hair dye products

 It is an ingredient that makes the final product more attractive from an aesthetic point of view, but can pose a potential health risk with undesirable side effects especially when used continuously as it can be absorbed through the skin or mucous membranes.

Safety

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

The problem with azo dyes (monoazo or diazo) is photocatalytic degradation leading to oxidation and the 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.)

Use in hair colouring products is prohibited.

Molecular Formula    C₃₀H₃₁ClN₄O₇S

Molecular Weight    496.3 g/mol

CAS   6410-41-9

EC number 229-107-2

UNII 91OZU993LX

DTXSID0050394

Synonyms: 

Pigment Red 5

CARMINE RED FB

NAPHTHOL RED DEEP 10460

PERMANENT CARMINE FB

PERMANENT CARMINE FB 01