Sennelier Watercolour S4 Aureoline 21 ml

Cobalt Yellow is an expensive, transparent, pure yellow with only adequate hiding power. It is reliable in watercolour and makes perfect tints. However, it must be carefully manufactured in oil form, or it can brown. Cobalt Yellow is known for good mixing quality with all other pigments and is useful in glazes and tinting.

Permanence: Cobalt Yellow has good permanence and lightfastness and can withstand strong sunlight.

Toxicity: Cobalt Yellow is highly toxic by inhalation or ingestion. The ingestion of this pigment has caused cyanosis (low oxygen levels in the blood) due to methemoglobinemia.

History: Cobalt comes from the Middle High German word Kobalt, an underground goblin because miners thought cobalt harmed silver ores. In 1848, N.W. Fischer, in Breslau, discovered the potassium and cobalt compounds used to make Cobalt Yellow. Four years later, Saint-Evre in Paris introduced it as an artist’s pigment. During the previous century, it was considered the only colour that could reasonably replace Indian Yellow.

Alternate Names: Aureolin.