Anthraquinone BlueColor: Anthraquinone BluePermanence: AAOpacity: OpaquePigment: PB60Pigment description: IndanthroneASTM Rating Ligthfastness: IPigment classification: Synthetic organicColor Index Number: 69800Viscosity 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 and soil, such as natural earth colors, siennas