dye|World dye variety

Name:C.I.Direct Green 21,C.I.31790

Molecular Structure: trisazo class

C.I.Direct Green 21,C.I.31790,CAS 8003-52-9,985.8,C39H23N7Na4O13S3,Formanil Green GB

Molecular Formula:C₃₉H₂₃N₇Na₄O₁₃S₃

Molecular Weight: 985.8

CAS Registry Number:8003-52-9

Manufacturing Methods : 4-(4-Aminophenyl)benzenamine double nitriding, coupled with 2-Hydroxybenzoic acid , and then and 5-Aminonaphthalene-2-sulfonic acid and 8-Aminonaphthalene-2-sulfonic acid coupling, its product to diazo, in alkaline conditions and 4-Amino-5-hydroxynaphthalene-1,3-disulfonic acid coupling.

Properties and Applications: dark green. Soluble in water for SAP green, slightly soluble in soluble fiber element, insoluble in other organic solvents. The strong sulfuric acid in the dark for the light blue, green for blu-ray diluted, accompanied by precipitation; Dye solution was added 10% sodium hydroxide solution as a pale red brown.

List of Suppliers:

Formanil Green GB( American Aniline Products Inc.  )