CI 42045 or Acid Blue 1  is a synthetic, triphenylmethane dye. Triphenylmethane is a dark blue hydrocarbon.

Chemical Name: sodium;4-[[4-(diethylamino)phenyl]-(4-diethylazaniumylidenecyclohexa-2,5-dien-1-ylidene)methyl]benzene-1,3-disulfonate

What it is used for and where

Cosmetics

Restricted cosmetic ingredient as IV/59 (CI 42045) II/1355 (Acid Blue 1; CI 42045)  ca Relevant Item in the Annexes of the European Cosmetics Regulation 1223/2009. Substance or ingredient reported: 

•   Ammonium, (4-(alpha-(p-(diethylamino)phenyl)-2,4-disulfobenzylidene)-2,5-cyclohexadien-1-ylidene)diethyl-, hydroxide, monosodium salt
• Ethanaminium, N-(4-((4-diethylamino)phenyl)(2,4-disulfophenyl)methylene)-2,5-cyclohexadien-1-ylidene)-N-ethyl-, hydroxide, inner salt, sodium salt (Acid Blue 1; CI 42045) when used as a substance in hair dye products

Cosmetica - Funzioni INCI

Colorant. This ingredient has the function of colouring the solution in which it is inserted in a temporary, semi-permanent or permanent manner, either alone or in the presence of the complementary components added for colouring.

Safety

It is an ingredient that has some important health-related contraindications: it must not come into contact with mucous membranes.

Use in hair colouring products is prohibited.

Molecular Formula     C₂₇H₃₁N₂NaO₆S₂

Molecular Weight    566.7 g/mol

CAS    129-17-9

EC number 204-934-1

UNII FH1929ICIT

DTXSID3026065

Synonyms: 

Acid blue 1

Patent Blue VF

Sulfan Blue