... Cas No. 1937-37-7 2.MF:781.73 3.C.I.Direct black 38 4.Brown Black even Crystalline powder ... Direct Black EX,C.I.Direct black 38,Direct dyes black for cotton(C.I.DIRECT BLACK ... Formula] : C34H25N9Na2O7S2 [ Colour Index ] : C.I. Direct Black 38[Cas No]. 1937-37-7[Molecular Weight]: 781.73[H ... ,71,86,151Direct Green 6Direct Black 9,19,22,38,56,71Direct Violet 1,12other direct dyestuffs we can ...