Rublev Colours Bone Black also known as ‘bone char’ or ‘animal charcoal’, is produced by charring animal bones. The bones are heated to high temperatures without oxygen. It consists mainly of calcium phosphate and a smaller amount of carbon. Ivory black is an artists’ pigment formerly made by grinding charred ivory. Ivory is no longer used because of the expense, and because animals that are natural sources of ivory are subject to international control as endangered species. Today, ivory black is considered a synonym for bone black. Among artist pigments, ivory black is considered a better grade of bone black, consisting of 15 percent or more carbon. We use only the best grade of bone char containing at least 18 percent carbon. Rublev Colours bone char oil paint is named ‘Bone Black’ because we use the name of the actual pigment for our colors.
Composition and Permanence| Bone Black | |
| Color: | Black |
| Binder: | |
| Additive(s): | None |
| Pigment Information | |
| Pigment: | |
| Pigment Classification: | Natural organic |
| Colour Index: | Pigment Black 9 (77267) |
| Chemical Name: | Hydroxyapatite (calcium phosphate) and carbon |
| Chemical Formula: | Ca5(OH)(PO4)3 and C |
| CAS No. | |
| Properties | |
| Code: | 903 |
| Series: | 1 |
| Opacity: | Opaque |
| Tinting Strength: | High |
| Drying Rate: | Medium |
| ASTM Lightfastness: | I |
| Permanence: | A |
| Safety Information: | 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 |
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Some separation of pigment and oil may occur in Rublev Colours Artist Oils and is a natural process when no wax or stabilizers are added to paint to prevent this from occurring.
All images of color swatches on this website are only approximations of the actual color of the oil paint. We have taken every care to match the color in these pictures on calibrated color monitors to the actual color. However, because of the wide variance in color monitors, the results you get may vary.
Color Swatch Note: The color swatch was created with a thick application (left side) of color and a tint (right side) made with equal parts of color and titanium white and applied on acrylic primed cotton canvas.
Drawdown Note: The image of the "drawdown" contains a pre-mixed paint film of 6 mils (0.006 inches) thickness applied to a standard test card for the purposes of examining color consistency, opacity, and other qualities. The drawdowns show the color full strength (mass tone), on the left, and mixed in a 1:2 ratio with titanium white on the right. The bottom area of the drawdowns is scraped to show undertones.