Cobalt Violet Ultra Dark Pigment
Rublev Colours Cobalt Violet Ultra-Dark pigment is an ultra-dark blue-violet. It is nonstaining with low tinting strength and is fast drying in oils where the cobalt content acts as a drier. Learn more about Cobalt Violet Ultra-Dark.
Rublev Colours Cobalt Violet Ultra-Dark pigment is an ultra-dark blue-violet. It is nonstaining with low tinting strength and is fast drying in oils where the cobalt content acts as a drier.
| Pigment Nomenclature | |||
| Common Name | Mineral Name | Chemical Name | Source/Origin |
| Cobalt violet | None | Cobaltous phosphate | United Kingdom |
| Common Names: | English: cobalt violet French: violet de cobalt German: Kobaltviolett Italian: viola cobalto Russian: кобальтовый фиолетовый Spanish: violetto cobalto | ||
| Synonyms: | Caprice Violet C.I. Pigment Violet 14 Cobalt Magenta Cobalt Phosphate Cobalt Pink Cobalt Raspberry Cobalt Red Cobalt Red Violet Cobalt Rose Cobalt Violet Cobalt Violet Brilliant, dark Cobalt Violet Dark Cobalt Violet Deep Cobalt Violet Light Cobalt Violet Pale Cobalt Violet Phosphate Cobalt Violet Pink Shade Cobalt Violet Pink Shade Light Cobalt Violet Medium Cobalt Violet Rose Cobalto Violeta Kobalt Violet Light True Cobalt Violet Pigment Violet 14 True Cobalt Violet Light Violet de Cobalt Violetto Cobalto | ||
| Pigment Information | |
| Color: | Violet |
| Colour Index: | Pigment Violet 14 (77360) |
| Chemical Name: | Cobaltous Phosphate or Cobalt(II)-Phosphate |
| Chemical Formula: | Co3(PO4)2 |
| CAS No.; | 13455-36-2 |
| ASTM Lightfastness Rating | |
| Acrylic: | Not Listed |
| Oil: | I |
| Watercolor: | I |
| Properties | |
| Density: | 3.81 g/cm3 |
| Oil Absorption: | 34–37 grams oil / 100 grams pigment |
| Refractive Index: | nD=1.7 |
History and Origin
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.
It is chemically stable, but its rather high cost and low tinting power prevented its wider use in paintings. Not unlike its older sister cobalt green, its drawbacks included high cost and weak coloring power, both of which limited its use among painters. It was quickly replaced by the cleaner, stronger pigment manganese violet.
Source
Cobalt Violet Ultra-Dark is a synthetic inorganic pigment composed of calcined cobalt (II) oxide and phosphorus (V) oxide, forming an inter-diffused, homogeneous crystalline phosphate.
Permanence and Compatibility
Cobalt violet is considered to be very permanent but the light variety could change in oil due to the yellowing of linseed oil. It is compatible with all painting media. Their transparency, weak tinting strength, and high cost limited their use but their fastness to light made them more desirable than the older organic dye violets.
Oil Absorption and Grinding
Cobalt violet absorbs a moderate amount of oil (34 to 37 grams per 100 grams of pigment), which slows the drying of oil paint and hence is a moderate drying oil color. It disperses well in both oil- and water-based paints and is easy to mull by hand to a smooth paste.
Toxicity
Cobalt violet is not considered toxic, but care should be used in handling the dry powder pigment to avoid inhaling respirable dust particles.
| SKU | 459-15 |
|---|---|
| Brand | Rublev Colours |
| Vendor | Natural Pigments |
| Processing Time | Usually ships the next business day. |
| Color | Violet |
| Pigment Type | Inorganic, Synthetic |
