Product description: Direct Black EX Name:C.I.Direct Black 38,C.I.30235 Molecular Structure: trisazo class C.I.Direct Black 38,C.I.30235,CAS 1937-37-7,781.73,C34H25N9Na2O7S2,Direct Black BN,Direct Black BRN,Direct Black BX,Direct Black EX,Direct Black RN Molecular Formula:C34H25N9Na2O7S2 Molecular Weight: 781.73 CAS Registry Number:1937-37-7 1.Properties and Applications: black. Palm black powder. Soluble in water for green light black, solubility 40 g/l (85 ℃), 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 ℃ temperature when the biggest affinity. Can discharge. 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. Standard Acid Resistance Alkali Resistance Light Fastness Soaping Water Fading Stain Fading Stain ISO 3 3 3 2 2-3 AATCC 3 3 4-5 3 2   2.International similar brand Direct Black BN Direct Black BRN Direct Black BX Direct Black EX Direct Black RN Apollo Direct Deep Black EX Atul Direct Black E Atul Leather Black DE Bitamine Direct Black EG Bitamine Direct Black ER Black E-Greener & Redder Black EX Concorde Direct Black EX