All Pigments
Colour Index Code
PY40
Aureolin / Cobalt Yellow
- Chemistry
- Cobalt potassium nitrite
- Origin
- Synthetic inorganic.
- History
- Introduced 1831; bright and transparent but somewhat fugitive and cobalt-based.
- Toxicity
- Cobalt - care required.
Aureolin / Cobalt Yellow (PY40) is Cobalt potassium nitrite.
- Lightfastness
- Excellent
PY40: Questions & Answers
What is PY40?
PY40 (Aureolin / Cobalt Yellow) is Cobalt potassium nitrite. Synthetic inorganic..
What is the chemistry of PY40?
PY40 is Cobalt potassium nitrite.
Is PY40 toxic?
Cobalt - care required.
Is PY40 lightfast?
In the Michael Harding range, colours using PY40 are rated excellent for lightfastness.
Which Michael Harding colours use PY40?
PY40 appears in 1 Michael Harding colour: Cobalt Yellow (Aureolin).
Michael Harding colours using PY40
1 colour across both rangesLightfastness: ExcellentOil Colours containing PY40
1 colour
Watercolours containing PY40
0 coloursNo Michael Harding watercolour colours currently use PY40.
| Colour | Medium | Transparency | Lightfastness | Granulation |
|---|---|---|---|---|
| Cobalt Yellow (Aureolin) No. 501 | Oil | Transparent | Excellent | — |
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