Aureolin
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Aureolin (sometimes called Cobalt Yellow) is a pigment used in oil and watercolor painting. Its pigment number is PY40 (40th entry on list of yellow pigments). It was first made in 1851 and its chemical composition is potassium cobaltinitrite.
Aureolin is rated as an impermanent, transparent, lightly staining, light valued, intense medium yellow pigment. It is a rather expensive pigment and sold by several manufacturers of oil paints such as Winsor & Newton, Grumbacher and Holbein.