dye|World dye variety

Name:C.I.Direct Black 20,C.I.30395

Molecular Structure: trisazo class

C.I.Direct Black 20,C.I.35255,CAS 7237-47-0,898.83,C38H32N10Na2O10S2,Direct Blue Black BM

Molecular Formula:C₃₈H₃₂N₁₀Na₂O₁₀S₂

Molecular Weight: 898.83

CAS Registry Number:7237-47-0

Manufacturing Methods : 3,3′-Dimethoxylbenzidine double nitriding, in alkaline conditions and 4-Amino-5-hydroxynaphthalene-2,7-disulfonic acid, and then three with Benzene-1,3-diamine coupling, N-(4-aminophenyl)acetamide diazo, and formation of accidentally coupled nitrogen compounds.

Properties and Applications:  blue and black. Moderate soluble in water (for violet black) and ethanol (for dark purple). The strong sulfuric acid for Gray light black, diluted for dark purple. The dye solution to join strong hydrochloric acid have dark purple precipitation; Add thick sodium hydroxide solution have sauce red precipitate.

List of Suppliers:

Direct Blue Black BM( IG Farbenindustrie AG )