Direct Black 131
Name:C.I.Direct Black 131,C.I.30270
Molecular Structure: trisazo class
C.I.Direct Black 131,C.I.30270,CAS 6486-54-0,918.82,C38H25N8Na3O10S3,Cotton Black 3G
Molecular Formula:C38H25N8Na3O10S3
Molecular Weight: 918.82
CAS Registry Number:6486-54-0
Manufacturing Methods : 4-(4-Aminophenyl)benzenamine double nitriding, in acid conditions and 4-Amino-5-hydroxynaphthalene-2,7-disulfonic acid coupling, aniline diazo, in alkaline conditions and accidentally coupled nitrogen compounds, and then and 5-Aminonaphthalene-1-sulfonic acid coupling.
Properties and Applications: navy blue green light to the dark. Soluble in water for deep blue light gray, slightly soluble in alcohol. The strong sulfuric acid for blue-ray in black, Gray light blue for diluted.
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