Direct Black 56

Colour Fastness Test

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.

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.