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Pigment Brown 28

Catalog Number DYE-PIG-0265
CAS Number 131-92-0
Structure
Synonyms Fast Brown R, Natural Violet RL
Molecular Weight 665.65
Molecular Formula C42H23N3O6
CI Number C.I.69015
Color brown.
Lightfastness Excellent
Main Molecular Structure anthraquinones
Preparation Method N-(5-chloro-9,10-dioxo-9,10-dihydroanthracen-1-yl)benzamide and N-(4-amino-9,10-dioxo-9,10-dihydroanthracen-1-yl)benzamide in the presence of copper benzamide condensation, cyclization and sulfuric acid.
Properties Slightly soluble in Xylene. In concentrated sulfuric acid for dark wine red, red, brown after dilution with flocks; In the basic insurance powder solution for red brown; In the acidic insurance powder solution for yellow brown.
Soap Micelle Bleeding Good

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