Unformatted text preview: and perfect blue. Another modern color is cobalt blue, an oxide of tin. The mineral cobalt was known in early times but it was not until the 18th century that they knew how to extract it from the ore. Colors such as Prussian blue or the lakes fade under the bleaching action of the lime. Malachite, a copper ore, is a source for much of the green during the Renaissance -- it is too expensive now. Because of the rarity of malachite it has been replaced by viridian, a modern permanent pigment which is a combination of oxygen and chromium. We also have cobalt greens....
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- Fall '10
- Pigment, Lapis lazuli, Siberia, Viridian