CAS Registry Number

CAS 6739-62-4 — Trisodium 2-{[2-amino-6-({4'-[(3-carboxylato-4-hydroxyphenyl)diazenyl]-3,3'-dimethoxybiphenyl-4-yl}diazenyl)-5-hydroxy-7-sulfonato-1-naphthyl]diazenyl}-5-nitrobenzoate (Direct Black 91)

Direct Black 91 is a synthetic azo dye primarily used for coloring textiles and paper products. This chemical compound is identified by CAS number 6739-62-4 and carries no signal word for hazard classification. Molekula supplies Direct Black 91 from research to bulk quantities with full documentation and ISO 9001:2015 traceability.