Rublev Colours Pigment Cobalt Yellow (Aureolin) - 50 g

This pigment is a potassium or sodium-substituted potassium cobalt nitrite. The compound was discovered in 1831 but not introduced as a pigment until after 1851. However, the pigment never gained popularity as an oil colour and was much more widely available as a watercolour.

Cobalt yellow is slightly soluble in water and darkens when mixed with sodium sulfide and caustic soda. In admixtures with organic pigments, such as lakes of cochineal, indigo, etc., it causes the decomposition of these; the organic colours become altered in hue, and cobalt yellow becomes a brownish hue.

WARNING: Exercise care when using dry pigments. Do not eat, drink or smoke. Avoid breathing dust. Use a NIOSH-certified dust respirator. Wash hands immediately after use. If the creation of dust is likely, wear protective clothing.