Direct Blue 71

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Product Name:?Direct Blue 71
Chemical Name:?/
?C.1.DirectBlue71(34140); C.I. Direct blue71; Diazol Light BlueR;Direct deep blueL-3RB; Direct fast blue B2RL; Durazol Blue 2R; Sirius Supra Blue BRR;Sumilight Supra Blue BRR.
CAS No:?4399-55-7
MW: 1029.87
Direct dyes


Black powder. Water-soluble in general, the aqueous solution was blue; slightly soluble in ethylene glycol ether, very little soluble in ethanol, insoluble in other organic solvents. Its aqueous solution by adding concentrated hydrochloric acid to produce a blue precipitate, add concentrated alkali produce red purple precipitate. In concentrated sulfuric acid was blue to gray-black, diluted red-purple precipitation; in concentrated nitric acid was dark brown; in concentrated alkali solution does not dissolve; dissolved in concentrated ammonia was blue-violet. Dyeing case of copper, iron ions shade a slight change.


Direct fast blue B2RL for cotton, viscose fabric dyeing and direct printing, a red deep blue. The dyeing rate is good, transfer dyeing and level dyeing is poor. After dyeing by the dye-fixing agent treatment or resin finishing shade were slightly green. Can also be used for silk and fabric dyeing, as well as viscose vinylon blended fabric dyeing and printing, but also with the disperse dye bath with polyester and viscose blended fabric. Also used for leather, paper, soap coloring.

Storage: Storage should be cool and ventilated, away from heat, fire, to prevent sun exposure, heat is strictly prohibited.
Package:?25kg PP bag for solid powder. 200L or 250KG Drum for Liquid.


Appearance Black powder
Content 100%
Moisture ≤0.1%
Insoluble ≤0.1%
Melting point /

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