Product Name: Direct Black 38
C.I. No.: 30235
CAS No.: 1937-37-7
Molecular Formula: C34H25N9Na2O7S2
Molecular Weight: 781.73
Relative Name:
Direct Black BN,Direct Black BX,Direct Black EX,Direct Black RN,Direct Black BRN
 
Direct Direct Black 38 Physical Properties and light fastness, solubility. 
Direct Direct Black 38 Properties:black. Palm black powder. Soluble in water for green light black, solubility 40 g/l (85 ºC), and adequate soluble in alcohol for green light blue-black, right amount soluble in soluble fiber element, insoluble in other organic solvents. The strong sulfuric acid is a deep red in blue, diluted Purple dark reddish brown for to red light black precipitation; In nitric acid solution for yellow brown (not completely); In strong hydrochloric acid for dark red light black solution (don't). The dye solution to join strong hydrochloric acid for Purple dark reddish brown, precipitation; Concentrated sodium hydroxide solution is generated gray light blue precipitaten. Cellulose fiber of dyeing, the dye absorption rate as well, in 80 ºC temperature when the biggest affinity. Can discharge.
 
Applications:
Used for cotton, viscose, silk, polyamide fiber and its blending fabric, leather, wood, biological and plastic color, also used as the raw material of black ink.