Direct Black 19
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Direct Black 19
C.I.Direct Black 19
C.I.35255
CAS:6428-31-5
Synonymous names:Atul Direct Black VG (AP);Baycolor Black B (DYS);Benzo Fast Black G (DYS);Direct Black G (CFT,CIBA);Everdirect Black G (ECI);Kayarus Black G (CLAR);Levacell Black PN (DYS);Pergasol Black G (CIBA);Solar Black G (CLAR);Solopheyl Black GN (CIBA);Sumilight Black G (NSK);Tertrodirect Viscose Black GTN (CKC)
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Description
C.I.Direct Black 19
C.I.35255
CAS:6428-31-5
Synonymous names:Atul Direct Black VG (AP);Baycolor Black B (DYS);Benzo Fast Black G (DYS);Direct Black G (CFT,CIBA);Everdirect Black G (ECI);Kayarus Black G (CLAR);Levacell Black PN (DYS);Pergasol Black G (CIBA);Solar Black G (CLAR);Solopheyl Black GN (CIBA);Sumilight Black G (NSK);Tertrodirect Viscose Black GTN (CKC)
Physicochemical Properties: Black powder. Soluble in water (greenish-black), with solubility of 100 g/L (80°C). Slightly soluble in ethanol and acetone. In concentrated sulfuric acid, it appears as greenish-black, turning reddish-black upon dilution. Forms greenish-blue with concentrated sodium hydroxide. Slight color change with copper/iron ions.
Applications: A replacement for benzidine-based Direct Black BN. Widely used for dyeing/printing viscose, cotton knitwear, and silk. Post-treatment with fixatives recommended. Also for leather, paper, and ink manufacturing.
