Payne’s GreyColor: Paynes GreyPermanence: AAOpacity: OpaquePigment: PB29, PY42, PBk11Pigment description: Silicate of Sodium and Aluminum with Sulfur, Synthetic Iron OxidesASTM Rating Ligthfastness: IPigment classification: MixtureColor Index Number: Viscosity range (mPa. s): 800 1. 500 Color IndexThe pigments used for artists colors are inorganic as well as organic. The inorganic pigments have been used since antiquity; most of them are extracted from minerals