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Pigment Red 86

Catalog Number DYE-PIG-0438
CAS Number 6371-26-2
Synonyms Helindon Pink BN
Molecular Weight 482.21
Molecular Formula C18H10Br2O2S2
CI Number C.I.73375
Color brilliant red.
Lightfastness Well
Main Molecular Structure Thioindigo
Preparation Method (a) 6-Bromo-4-methylbenzo[b]thiophen-3(2H)-one oxidation; (b) (E)-4-methyl-2-(4-methyl-3-oxobenzo[b]thiophen-2(3H)-ylidene)benzo[b]thiophen-3(2H)-one bromide.
Properties Soluble in Xylene for blue light red, with yellow fluorescence. In concentrated sulfuric acid for deep green light blue, red blue after dilution flocculent precipitate; In the basic insurance powder solution for brown light yellow.
Soap Micelle Bleeding Slightly

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