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thionine
thionine n. 
/ˈθaɪənən/ a brownish-black dye, SC12H9N3, crystallizing in plates, called phenylene violet, or Lauth's violet, and largely used to stain microscopic objects.
Brit. /ˈθʌɪəniːn/
, /ˈθʌɪəniːn/U.S. /ˈθaɪəˌnin/
, /ˈθaɪəˌnin//ˈθaɪənən/ΘΚΠ
the world > matter > chemistry > chemical tests > indicators > [noun] > other indicators or biological stains
osmium tetroxide1869
thionine1886
neutral violet1890
carbol-fuchsin1891
triacid1896
1886 Jrnl. Chem. Soc. 50 53 The addition of strong hydrochloric acid does not turn the solution blue, as is the case with thionine.
1956 Thorpe's Dict. Appl. Chem. (ed. 4) XI. 590/1 Lauth had already indicated that bright blue dyes could be obtained by methylating thionine but such a process was not economic.
1976 Nature 1 Jan. 60/2 Feulgen reaction carried out on the specimens treated with..thionin and exposed to light gave differential staining.
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