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Pigment Red 49:3

Catalog Number DYE-PIG-0478
CAS Number 6371-67-1
Molecular Weight 378.4
Molecular Formula C20H14N2O4S
CI Number C.I.15630:3
Color brilliant blue light red.
Main Molecular Structure Single azo
Preparation Method 2-Aminonaphthalene-1-sulfonic acid diazotization, and Naphthalen-2-ol coupling, and then into strontium salt.
Properties Slightly soluble in hot water and ethanol, slightly soluble in acetone. In concentrated sulfuric acid to red light purple, purple red after diluted solution, and then have red brown precipitation; In concentrated nitric acid for brown light red solution; Slightly soluble in sodium hydroxide solution. Dye ethanol solution to join concentrated hydrochloric acid for brown light purple; Add sodium hydroxide color constant.

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