Direct Blue 42;altazine black bh;aizen direct black bh;Direct Diazo Black BH;amanil developed black bhsw;C.I.Direct Blue 42:C.I.22505;amanil developed black bhsw ISO 9001：2015 REACH;1'-biphenyl)-4- hydroxy-phthalenyl)azo)( trisodium salt;1'-biphenyl]-4-yl]azo]-4-hydroxy-phthalenyl)azo][ trisodium salt;1'-biphenyl)-4-yl)azo)-4-hydroxy-phthalenyl) azo)( trisodium salt
4-(4-Aminophenyl)benzenamine double nitriding, and 7-Hydroxynaphthalene-1-sulfonic acid coupling, and then in alkaline conditions and 4-Amino-5-hydroxynaphthalene-1-sulfonic acid coupling.
Properties and Applications
red light blue. Soluble in water for violet blue, soluble in alcohol for red light purple. The strong sulfuric acid for blue, purple precipitation after diluted. The dye solution to join hydrochloric acid for blue; Add sodium hydroxide solution for red light purple.
