120g jar. Pigment: Indigofera tinctoria (Genuine Indigo) Classification: Organic Colour Index: NB1 ASTM Lightfastness: III Hiding: Semi-Opaque Series 4 Professional quality artist pigment for paint-making Pigments need to be bound to become a paint. For this they are mixed with a binder. Langridge supplies artists with highest specification pigments sourced from around the world. Every colour is verified for its origin and identified for its chemical characteristics to provide the artist with a range of pigments noted for their quality of grade and fineness, ensuring the maximum benefit in tone and chroma. As colourmen, Langridge supplies traditional earths from original sources as well as constantly researching and selecting modern pigments to satisfy artist demand for new colours of vibrancy and intensity.