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Roussin's salt
Definition of Roussin's salt
: any of two series of alkali metal salts that are nitrosyl and sulfur complexes of iron: a : a red unstable salt having the general formula M[Fe(NO)2S] and obtainable by reaction of nitric oxide with ferrous sulfide b : a black more stable salt having the general formula M[Fe4(NO)7S3] and obtainable (as by treatment with alkali) from a red salt
From the M-W Editors
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Origin and Etymology of roussin's salt
after François-Zacharie Roussin †1894 French chemist
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