Potassium ethyl xanthate

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What Wikipedia says

Potassium ethyl xanthate (KEX, or PEX) is an organosulfur compound with the chemical formula CH3CH2OCS2K. It is a pale yellow powder that is used in the mining industry for the separation of ores. It is a potassium salt of ethyl xanthic acid. Many xanthates are known.

Excerpt from the Wikipedia article “Potassium ethyl xanthate”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

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