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Pigment Red 40

Catalog Number DYE-PIG-0485
CAS Number 2653-64-7
Synonyms Autol Red RLP
Molecular Weight 298.34
Molecular Formula C20H14N2O
Melting Point 224 ℃ (by toluene in crystallization bronze flake crystal).
CI Number C.I.12170
Color blue light red.
Lightfastness General
Main Molecular Structure Single azo
Oleic Acid Poor
Preparation Method Naphthalen-1-amine diazotization and Naphthalen-2-ol coupling.
Properties Soluble in hot ethanol and benzene in red. In concentrated sulfuric acid to red light blue, dilution after red purple solution, and then have red brown precipitation. Dye ethanol solution to join concentrated hydrochloric acid is dark red; With strong caustic for brilliant red light brown. And C.I.Solvent Red 4 the same chemical structure.
Soap Micelle Bleeding No

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