R&F Pigment Stick - Cobalt Yellow, 38 ml
It has a mustardy top tone but a vivid golden undertone. This is an excellent glazing colour. It is one of the only transparent yellows that is reliable and lightfast. It mixes slightly to the greenish.
- Pigment Composition: PY40-Cobalt Yellow
- Dimension: 38 ml. stick measuring 5" x 3/4" diameter
- Paint Lines: Encaustic, Pigment Stick
- Opacity: Transparent
- Pigment Stick Drying Rate: Fast
- Classification: Synthetic Inorganic
- Chemical Composition: Potassium cobaltinitrite
- Safety Information: Conforms to ASTM D-4236
- Safety Warnings: This product contains cadmium, a chemical known to the State of California to cause cancer.
Pigment Name: PY40 Cobalt Yellow
Classification: Inorganic
Chemical Composition: Potassium cobaltinitrite
Properties
Cobalt Yellow is an expensive, transparent, pure yellow with only adequate hiding power. It is reliable in watercolour and makes splendid 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-Ever in Paris introduced it as an artist’s pigment. It was considered the only colour that could reasonably replace Indian Yellow during the previous century.
