Direct Black 56

Direct Black 56 alias direct light fast ash LRN, direct ash L-8BR. The appearance is generally gray uniform powder.

• ‍It is dark green in water, insoluble in alcohol.
• It is green gray gray in concentrated sulfuric acid, after dilution Purple;
• its aqueous solution with concentrated hydrochloric acid has a dark blue precipitate, concentrated sodium hydroxide has a dark purple precipitate.
• It is somewhat sensitive to hard water.‍

TRADE NAME:

Direct fast gray LBN,Direct Gray L-8BR,Direct Light Fastness Gray LBN,Direct Light Fastness Gray LRN

Key Features

• High color strength for deep and vivid black shades
• Excellent wet and dry fastness
• Good compatibility with various fiber types
• Superior leveling and penetration on cotton and viscose
• Stable under standard dyeing conditions

Application of Direct Black 56:

It Mainly used for cotton, linen, silk, cellulose fiber fabrics such as glue the dyeing. Can also be used for leather, paper all the dyeing.

Use condition:

• ‍Direct Black 56 is mainly used for the dyeing of cellulose fiber fabrics such as cotton, hemp and viscose fiber.
• The dye dyeing rate is good, the affinity is the highest at 80 ° C.
• The dyeing property is very good. It can also be used for the dyeing of silk fabrics.‍

Technical Specifications

• ‍CAS NO: 8003-57-4
• CI.NO: 34170
• Molecular Formula: C36H22N7Na3O10S3
• Molecular Weight: 877.77
• Shade: red light grey. Gray powder.‍

Colour Fastness Test