Orange/red first synthesized in 1910. Because of its muted tints, excellent color for natural light painting. Pigment: Concentrated cadmium sulfo-selenide (PR 108) Vehicle: Alkali refined linseed oil Lightfastness I, Series 5, OPAQUE, MSDSOrange/red first synthesized in 1910. Because of its muted tints, excellent color for natural light painting. Pigment: Concentrate