CAS:4395-53-3
Molecular formula:C45H22N2O6
Molecular weight:686.6
Appearance:VAT black 25 is mainly used for dyeing cotton fibers. It has medium levelness and good affinity. It is generally used for dyeing dark gray and variegated colors. It is also used for dyeing silk, wool and polyester cotton fabrics.
Synopsis: Tan powder. It is green in concentrated sulfuric acid and produces black precipitation after dilution. It is reddish brown in concentrated nitric acid. It is gray in the alkaline solution of insurance powder and dark olive in the acidic solution.
Structural formula: