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Pigment Red 48

Catalog Number DYE-PIG-0481
CAS Number 3564-21-4
Synonyms Fast Scarlet, Lithol Fast Scarlet L, Permanent Red 2B, Watching Red
Molecular Weight 464.79
Molecular Formula C18H11ClN2Na2O6S
Alternative CAS 16013-44-8
CI Number C.I.15865
Color brilliant red.
Main Molecular Structure Single azo
Preparation Method 2-Amino-4-chloro-5-methylbenzenesulfonic acid diazotization, and 3-Hydroxy-2-naphthoic acid coupling.
Properties In concentrated sulfuric acid for wine red, after dilution blue light red precipitation; In concentrated nitric acid for brown light red; In concentrated sodium hydroxide solution to red.

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