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Pigment Red 50:2

Catalog Number DYE-PIG-0475
CAS Number 6373-04-2
Molecular Weight 292.29
Molecular Formula C17H12N2O3
Melting Point 176 ℃ (from the glacial acetic acid crystal).
CI Number C.I.15500:2
Color red light orange, shallow blue light pink.
Main Molecular Structure Single azo
Preparation Method 2-Aminobenzoic acid diazotization, and Naphthalen-2-ol coupling, and then into calcium salt
Properties Slightly soluble in water (orange) and ethanol. In concentrated sulfuric acid in scarlet, dilution have orange precipitation. Pigment solution to join hydrochloric acid have orange precipitation; Add sodium hydroxide into darker orange.

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