Nigrosine Black

Product Detail

Nigrosine Black

1. Solubility: In water, Nigrosine Black forms a bluish-purple solution, displaying good solubility, which allows it to interact with hydroxyl or amino groups in fiber materials, thereby achieving dyeing.The addition of sodium hydroxide solution results in the formation of a brownish-purple precipitate. Nigrosine Black is soluble in ethanol, exhibiting a blue color, and in concentrated sulfuric acid, it also appears blue; upon dilution, it changes to purple with a precipitate forming. Nigrosine Black is nearly insoluble in ether, acetone, benzene, chloroform, petroleum ether, and liquid paraffin.

2. Storage: Nigrosine Black should be kept away from contact with oxidizing agents during usage. When storing, ensure that the storage container is tightly sealed and store it in a cool and dry place.

Specification
Product Name	Nigrosine Black Granular
C.I.No.	Acid Black 2 (50420)
Appearance	Black Shining Granular
Shade	Similar to Standard
Strength	100 %
Moisture (%)	≤6
Ash (%)	≤1.7
Fastness
Light	5~6
Soaping	4~5
Rubbing	Dry	5
	Wet	-

Nigrosine Black Application

Nigrosine Black mainly used for dyeing on leather, it typically appears as a dark organic dye that imparts a deep black color to leather. Nigrosine Black also be used for dyeing of paper, wood, soap and wool. It has widespread applications in industries such as paper and printing.

Nigrosine Black on leather

1. Advantage: Nigrosine Black dispersed in aqueous solution to form colored anion, acid dye molecules are small, strong penetration, easy to spread to the inside of the leather, so conducive to dyeing through the leather.

2. Washing fastness: Nigrosine Black exhibits excellent washfastness, maintaining the dye’s color even at high temperatures and enhancing the durability of leather.

ZDH