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Pigment Red 7

Catalog Number DYE-PIG-0497
CAS Number 6471-51-8
Structure
Molecular Weight 464.34
Molecular Formula C25H19Cl2N3O2
Melting Point 285 ℃ (by toluene get crystal).
Appearance Red powder
CI Number C.I.12420
Color red, shallow blue light pink.
Lightfastness 7-8
Main Molecular Structure Single azo
Oleic Acid 1-2
Preparation Method 4-Chloro-2-methylbenzenamine diazotization, and N-(4-chloro-2-methylphenyl)-3-hydroxy-2-naphthamide coupling.
Properties In concentrated sulfuric acid for magenta, dilution after scarlet precipitation; In concentrated nitric acid for yellow solution; In the sodium hydroxide solution does not change color. Fast fastness 7 ~ 8 level, water resistant level 5, acid and alkali resistant 4 ~ level, solvent resistance is poor. Mainly used in coating, printing ink, viscose of protoplasm coloring, also used for paper and cosmetics coloring.
Soap Micelle Bleeding 3-4

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