Specification Product Name AMIDO BLACK 10B Synonyms Naphthol Blue Black; Amido Schwarz; 4-Amino-5- Hydroxy-3-(p-nitrophenylazo)-6-(phenylazo)-2,7- naphthalenedisulfonic acid, disodium salt C.I. NO. 20470 CAS NO. 1064-48-8 Molecular Formula C22H14N6O9S2Na2 Formula Weight 616.50 Appearance Dark brown to reddish-black powder Structure     Tests    Limits Solubility 0.1% (dist.water) - Clear blue solution Loss on drying at 105 deg. C - 10.0% maximum         REVISED: 1-1-2012