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

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

Application:

Direct Black 56 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.‍

FAQ

What fastness properties does Direct Black 56 have?

It exhibits excellent wet and dry fastness, as well as good light fastness, making it suitable for textiles that require long-lasting color stability.

Can Direct Black 56 be mixed with other dyes?

Yes, it can be blended with other direct dyes to achieve custom shades. However, testing small batches is recommended to ensure consistent results and color uniformity.

Are there environmental considerations for using Direct Black 56?

While Direct Black 56 is safe for standard textile applications, proper handling and wastewater treatment are advised to minimize environmental impact, in line with industrial safety standards.