C. I. Number: Pigment Red 2 CAS Number: 6041-94-7 EU Number: 227-930-1 Pigment Red 2 (Fast red F2R/ Fast ... 2 (Fast red F2R/ PR2) C. I. Number: Pigment Red 2CAS Number: 6041-94-7EU Number: 227-930-1Chemical Family: Mono azo 2 ... .R.8, P.R.21, P.R.22, P.R.23, P.R.31, P.R.48:1, P.R.48 ... KB, Naphthol ITR, Naphthol AS-SG. Pigment Red 2/CAS Number: 6041-94-7