Scheele's Green, also called Schloss Green, is chemically a cupric hydrogen arsenite (also called copper arsenite or acidic copper arsenite), CuHAsO3. It is a compound similar to Paris Green. It is a green pigment, of yellowish hue and was used in the past in some paints but has since fallen out of use due to its toxicity.
Scheele's Green was invented in 1775 by Carl Wilhelm Scheele. By the end of the 19th century, it virtually replaced the older...
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Scheele's Green, also called Schloss Green, is chemically a cupric hydrogen arsenite (also called copper arsenite or acidic copper arsenite), CuHAsO3. It is a compound similar to Paris Green. It is a green pigment, of yellowish hue and was used in the past in some paints but has since fallen out of use due to its toxicity.
Scheele's Green was invented in 1775 by Carl Wilhelm Scheele. By the end of the 19th century, it virtually replaced the older green pigments based on copper carbonate.
The pigment was originally prepared by making a solution of sodium carbonate at a temperature of around 90 °C, then slowly adding in arsenious oxide, while constantly stirring until everything had dissolved. This sodium arsenite solution was then added to a copper sulfate solution. The sodium would displace the copper, which resulted in the formation of the desired product in the form of a green precipitate. This copper arsenite was then filtered off and warmed to around 43 °C to dry the crystals. To...
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