Its color index name is PY40 (40th entry on list of yellow pigments). It was first made in 1831 by Nikolaus Wolfgang Fischer in Breslau characterizing it as "Doppelsalze" or double-salts and its chemical composition is potassium cobaltinitrite. He characterized it again and wrote more extensively about it in 1842, naming it "Salpetrichtsaures Kobaltoxydkali".
The pigment PY40 (40th entry on the list of yellow pigments) was first created by Nikolaus Wolfgang Fischer in Breslau in 1831. It is known as "Doppelsalze" or double-salts and its chemical composition is potassium cobaltinitrite.  Fischer further characterized it and wrote more extensively about it in 1842, renaming it "Salpetrichtsaures Kobaltoxydkali".