The Gmelin test for sulphide ions and organic thiolate anions, in which sodium nitroprusside [disodium nitrosopentacyanoferrate(II) dihydrate, Na2FeNO(CN)5.2H2O] gives a reddish purple colour in ammonia solution, has been found to be positive for non-aromatic thiols but negative with aromatic thiols.
J. P. Danehy, Analyst, 1986, 111, 723 DOI: 10.1039/AN9861100723
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