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| | handprint : synthetic inorganic pigments |
 | | Use of chrome colors began to decline steadily in the 20th century because most shades contain lead and the light yellow shades are impermanent (they fade in light and flen when mixed with sulfur pigments), even after the introduction in the 1950's of more lightfast, silica encapsulated lead chromates. |
 | | All cobalt pigments are manufactured by calcining (roasting at extremely high temperatures) a mixture of cobalt oxide with an alkaline carbonate and, to produce the various colors, compounds of other metals (phosphorus, aluminum, tin, chromium, titanium, zinc or potassium); the resulting matrix is then ground into a fine powder. |
 | | The color was known in Europe as early as 1780, and used infrequently throughout the 19th century, mostly in watermedia paints. |
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