Description
Rublev Colours Cobalt Violet
The remarkable range of pigments that could be produced with cobalt included cobalt violet, is known since 1859. Salvetat first described the preparation of cobalt violet in Comptes Rendus des Seances de l’Academie des Sciences XLVIII in an article titled, “Matieres minerales colorantes vertes et violettes.” The dark variety is anhydrous cobalt phosphate which was made by mixing soluble cobalt salt with disodium phosphate. It was washed and then heated at a high temperature.
| Color Information | |
| Single Pigment: | Cobalt Violet |
| Binder: | Gum Arabic |
| Pigment Information | |
| Color: | Blue, Violet |
| Colour Index: | Pigment Violet 14 (77360) |
| Chemical Name: | Cobaltous Phosphate or Cobalt(II)-Phosphate |
| Chemical Formula: | Co3(PO4)2 |
| Properties | |
| ASTM Lightfastness: | I |
| Opacity: | Semi-Transparent |
| Tinting Strength: | High |
| Staining: | Average |
Health and Safety: There are no acute or known chronic health hazards associated with the anticipated use of this product (most chemicals are not fully tested for chronic toxicity). Always protect yourself against potentially unknown chronic hazards of this and other chemical products by keeping them out of your body. Do this by avoiding ingestion, excessive skin contact, and inhalation of spraying mists, sanding dusts and vapors from heating. Conforms to ASTM D-4236.
Note: Some separation of pigment and medium may occur in Rublev Colours Watercolors and is a natural process when no stabilizers are added to paint to prevent this from occurring.
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