dye|World dye variety

Name:C.I.Direct Red 257,C.I.291755

Molecular Structure: Double azo class

C.I.Direct Red 257,C.I.291755,1063.08/1151.18,C41H44N8Na2O15S4/C45H52N8Na2O17S4,Duasyn Direct Red G

Molecular Formula:C₄₁H₄₄N₈Na₂O₁₅S₄/C₄₅H₅₂N₈Na₂O₁₇S₄

Molecular Weight: 1063.08/1151.18

CAS Registry Number:

Manufacturing Methods : 4-Aminobenzenesulfonic acid (2 Moore) diazo, and N,N’-bis(4-hydroxy-2-sulfonaphthalene-7-yl)urea coupling, and then into 2-(2-Hydroxyethylamino)ethanol(C.I. 29176) (the components of the dye content is 25%). 4-Amino-5-methoxy-2-methylbenzenesulfonic acid (2 Moore) diazo, and N,N’-bis(4-hydroxy-2-sulfonaphthalene-7-yl)urea coupling, and then into 2-(2-Hydroxyethylamino)ethanol (C.I. 29177) (the components of the dye content is 75%).

Properties and Applications:  red. Mainly used for paper color

List of Suppliers:

Duasyn Direct Red G( DyStar GmbH & Co Deutschland KG )