Direct Black 168

Direct Black 168 is a water-soluble direct (substantive) dye designed primarily for dyeing cellulosic fibers (cotton, viscose/rayon) and for certain printing and paper coloration applications. It offers strong affinity to cellulose, good leveling in typical exhaustion and pad/printing processes, and predictable fastness when used with appropriate auxiliaries and post-treatments.

TRADE NAME:Direct Black 5B,Direct Black AR,Direct Black HEF,ACDI Black BH-NB 125%,Anadurm Black D-NB,Anardirect Black HEF,Apollo Leather BlackPAN,Best Direct Black SB,BlackJK5Black PS,Coranil Direct Black HEF

Key Features

• High tinctorial strength for deep, even black shades
• Good wet fastness on cellulosic fibers after aftertreatment
• Excellent substantivity — performs well in exhaustion and pad dyeing
• Stable in neutral to mildly alkaline dyeing baths
• Low tendency to bleed or migrate when fixed properly
• Compatible with common leveling and dispersing auxiliaries
• Suitable for reactive blending with other direct dyes for shade adjustment
• Easy to disperse and dose in aqueous systems

Application:

Direct Black 168 Used for cotton, viscose, silk dyeing and printing. Can also be used for leather shading.

Technical Specifications

• ‍CAS NO: 85631-88-5/83046-38-2
• CI.NO: 335475
• Molecular Formula: C34H23N8Na3O11S3
• Molecular Weight: 884.76
• Shade: Black.‍

FAQ

How do I improve washfastness?

Use leveling agents and after-treatment with appropriate fixing agents (e.g., salt/acid fixation or polymeric fixatives) and optimize temperature/time; untreated dyeings often show only moderate washfastness. 

Can it be used in inkjet or printing inks?

Yes — available liquid grades and formulations are used in ink and inkjet pigments, but require dispersion/stabilizers and filtration to prevent nozzle clogging.