Product description: Direct Copper Blue 2B Name:C.I.Direct Blue 168,C.I.24185 Molecular Structure: Double azo class C.I.Direct Blue 168,C.I.24185,CAS 3818-60-8,849.8,C40H29N5Na2O10S2,Direct Copper Blue 2B,Direct Copper Blue RR,Direct Blue Light Fast G Molecular Formula:C40H29N5Na2O10S2 Molecular Weight: 849.8 CAS Registry Number:3818-60-8 1.Properties and Applications: red light blue. Dark blue uniform powder. Soluble in water for deep purple, and adequate soluble in ethanol for red light purple. The strong sulfuric acid for Tracy in blue, and in purple for diluted. The dye solution to join strong hydrochloric acid for purple, have precipitation; Add thick, hydrogen oxidation solution into a red wine. Mainly used for cotton, hemp, such as glue of cellulose fiber dyeing, also can be used for silk, polyamide fiber and stick/jin blended fabric dyeing. Standard Acid Resistance Alkali Resistance Light Fastness Soaping Water Fading Stain Fading Stain ISO 4 3-4 2 2 2   2.International similar brand Atul Direct Copper Blue RR Concorde Direct Copper Blue 2B Dinamine Copper Blue RR Direct Blue Light Fast G Kayaku Direct Copper Blue 2B Mitsui Direct Copper Blue 2B