The blues - and perfect blue Another modern color is cobalt...

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The blues, purples, and several greens are rarer. The Egyptian blue and green frits used during the classical period have been lost. Genuine ultramarine is made from the lapis lazuli, a precious stone found in Siberia and other eastern places. Ultramarine is a chemical compound in lapis lazuli. During the early Renaissance, the utmost pain was used in its preparation and it was so precious that it was generally confined to the virgins robe. Today we also have an artificial ultramarine, also permanent but not with the quality of the genuine. It is not so subtle or true as it tends toward a violet, while real ultramarine is a most delicate
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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 Because of the rarity of malachite it has been replaced by viridian, a modern permanent pigment which is a combination of oxygen and chromium.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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