Products Name CAS No D A S A (4,4 – DIAMINO SULFANILIDE) 16803-97-7 H – ACID (NORMAL GRADE) 5460-09-3 PTOSA (P-TOLUIDINE-O-SULFONIC ACID) 118-88-7 2-CHLORO PPD SULPHATE 6219-71-2 4-CHLORO METANILIC ACID 98-36-2 6-NITRO BENZOXAZOLONE 4694-91-1 VIOLET ACID (1-NAPTHOL – 3, 6-DISULPHONIC ACID) 578-85-8 V. S. PYRAZOLONE 219