OAPSA is an important intermediate. But mainly used for manufacturing quality Reactive & Direct Dyes.

Its Physical Appearance is grey to light grey and it’s Molecular Weight 189.19

CI Name 2-Amino Phenol 4- Sulphonic Acid
Application Raw Material for manufacturing Reactive Red 35, Direct Brown BRLL, Direct Red 16, Direct Red 83:1, Modern Brown, BLACK PV