Color Index and Pigments names

The Color Index system is an international standard to denominate dyes and pigments. A combination of letters and numbers indicate the colour category. For example: PO 20, means Pigment Orange 20. Color Index names are: PW (Pigment White) / PY (Pigment Yellow) / PO (Pigment Orange) / PR (Pigment Red) / PV (Pigment Violet) / PB (Pigment Blue) / PG (Pigment Green) / PBr (Pigment Brown) / PBk (Pigment Black).