N N Dye Tech: Seller of: direct violet 51, direct red 9, direct red 31, direct violet 7, direct yellow 12, direct black ex, direct yellow 28, acid yellow 36, acid red 88. Buyer of: h acid, gamma acid, salisylic acid, na-naphthionate, p-j-acid, di j acid, p chrysidine, sulfanilic acid, dtptsa dtts.