Xanthate usually refers to a salt with the formula ROCS₂M (R = alkyl; M+ = Na, K). The name xanthates is derived from Greek ξανθός [ksantʰós], meaning “yellowish, golden”, and indeed most xanthate salts are yellow. They were discovered and named in 1823 by the Danish chemist William Christopher Zeise. These organosulfur compounds are important in two areas, the production of cellophane and related polymers from cellulose and secondly in mining for the extraction of certain ores. They are also versatile intermediates in organic synthesis. Xanthates also refer to esters of xanthic acid. These esters have the structure ROC(=S)SR'.