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Pigment Red 57

Catalog Number DYE-PIG-0466
CAS Number 5858-81-1
Structure
Synonyms Unisperse Rubine 4BA-PA, Rubine Toner, Navifast Rubine Toner
Molecular Weight 430.34
Molecular Formula C18H12N2O6S
CI Number C.I.15850
Color blue light red.
Main Molecular Structure Single azo
Preparation Method 2-Amino-5-methylbenzenesulfonic acid diazotization, and 3-Hydroxy-2-naphthoic acid coupling.
Properties Soluble in hot water for yellow red, not soluble in ethanol. In concentrated sulfuric acid for magenta, dilution after magenta precipitation. Pigment solution to join concentrated hydrochloric acid have brown light red precipitation; Join concentrated sodium hydroxide solution for brown.

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