Difference between revisions of "Purple of Cassius"
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== Other Properties == | == Other Properties == | ||
| − | Soluble in ammonia.Insoluble in water. | + | Soluble in ammonia. Insoluble in water. |
| − | Resistant to high temperatures | + | Resistant to high temperatures. |
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[[Category:Materials database]] | [[Category:Materials database]] | ||
Revision as of 10:03, 22 November 2016
Description
A permanent red-violet pigment. Purple of Cassius was first made by Andreas Cassius in Germany in 1676. It is composed of fine particle gold precipitated on hydrated stannic oxide when tin chlorides are mixed into a dilute gold chloride solution. The addition of potassium carbonate to the solution deepens the purple color. Purple of Cassius was used until the mid 19th century when it was replaced by cobalt violet. The expensive pigment was used in miniature paintings and to make ruby glass and ceramic glazes.
Synonyms and Related Terms
purple-of-Cassius; gold-tin purple; gold purple
Other Properties
Soluble in ammonia. Insoluble in water. Resistant to high temperatures.