Ultramarine Violet: Mineral color that greys into the colors of the natural world. Warmer than Cobalt Violet, cooler than Manganese Violet and more transparent than either, Ultramarine Violet is one of many specialty pigments made by German chemists during the color revolution of the 19th century.

Pigment: Complex silicate of sodium & aluminum with sulfur (PV 15)
Vehicle: Alkali refined linseed oil
Lightfastness I, Series 2, TRANSPARENT

reference: www.gamblincolors.com