dithizone

noun
di·​thi·​zone | \dīˈthīˌzōn\
plural -s

Definition of dithizone 

: a bluish black crystalline compound C6H5N=NCSNHNHC6H5 used for the colorimetric determination of heavy metals (as lead)

called also diphenylthiocarbazone

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History and Etymology for dithizone

diphenylthiocarbazone

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