... HIGH QUALITY GOODS COMPETITIVE PRICE PROMPT SHIPMENT 6-NITRO-1-DIAZO-2 NAPHTHOL-4-SULFONIC ACIDAPPEARANCE:YELLOW BROWN CRYSTALCONTENT:75%MINPHLC CONTENT: ... 90% MININSOLUBILITY:0.15% MAXFEED ACID:3.5% MAX8-NITRO(HPLC): 4 ... such as C.I.Acid black 34,52,82,107,124,170,172,194 etc. 6-NITRO-1-DIAZO-2 NAPHTHOL-4-SULFONIC ACID