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Natural mineral (at Mineralogy Database) found throughout the world as a low-temperature product of hydrothermal veins, hot-spring deposits, and volcanic sublimation.
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Natural variety of pigment
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Mineral orpiment is heated with sulfur, allowing a more pure orpiment to sublime out. Orpiment is particularly difïfcult to grind into a pigment.
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Artificial variety of pigment
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Fusing of arsenic or arsenic oxide with sulfur.
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In the lab
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Method:
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The preparation in the laboratory should not be attempted due to the great toxicity of orpiment.
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