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Pigment Red 50

Catalog Number DYE-PIG-0477
CAS Number 5850-76-0
Synonyms Lake Red D
Molecular Weight 314.27
Molecular Formula C17H11N2NaO3
Melting Point 176 ℃ (from the glacial acetic acid crystal).
CI Number C.I.15500
Color red light orange, shallow blue light pink.
Main Molecular Structure Single azo
Preparation Method 2-Aminobenzoic acid diazotization, and Naphthalen-2-ol coupling.
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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