Product description: Direct Sky Blue 5B Name:C.I.Direct Blue 15,C.I.24400 Molecular Structure: Double azo class C.I.Direct Blue 15,C.I.24400,CAS 2429-74-5,992.81,C34H24N6Na4O16S4,Direct Blue B,Direct Sky Blue FB,Direct Sky Blue 5B Molecular Formula:C34H24N6Na4O16S4 Molecular Weight: 992.81 CAS Registry Number:2429-74-5 1.Properties and Applications:  blue. Blue powder. Soluble in water solution for the red light blue, solubility of 60 g/L (85 ℃), insoluble in organic solvents. Meet strong sulfuric acid as blue light green, diluted red for blue; Meet nitric acid solution for the red light gray. The dye solution to join strong hydrochloric acid for red light blue precipitation; Add thick sodium hydroxide solution for purple, have precipitation. Cellulose fiber of dyeing, the dye well after sex good, in 60 ~ 80 ℃ maximum of affinity, discharge the gender is good. Copper ions in dyeing color shade darker. Mainly used for cotton, such as glue the cellulose fibre,  silk and rayon / Kam fabric dyeing, also can be used for pulp, biological, film footage of dyeing, can also be used to make the ink. Standard Acid Resistance Alkali Resistance Light Fastness Soaping Water Fading Stain Fading Stain ISO 4-5 4 1-2 1-2 1-2 AATCC 5 4 1-2 2 1   2.International similar brand ACDI Sky 5B 200% Apollo Direct Sky Blue 5B Atul Direct Sky Blu Bitamine Direct Sky Blue FB  Blue 5B Blue 5BN Concorde Direct Sky Blue 5B Condirec Blue AE Direct Blue 5B Direct Blue FFN Direct Blue for paper Direct Fast Blue 5B Direct Pure Blue Direct Sky Blue 5B irect Sky Blue FF