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vesuvin

vesuvin Chem.
  (vɪˈsuːvɪn)
  [a. G. vesuvin, f. Vesuv-ius, from its explosive property: see -in1.]
  Phenyl-brown, used esp. as a staining matter for histological preparations.

1885 Klein Micro-Organisms 84 Stained with methylene blue and vesuvin. 1886 Buck's Handbk. Med. Sci. III. 678/1 Bismarck Brown, Vesuvin. The chloride of triamidoazobenzol. 1897 Allbutt's Syst. Med. II. 4 Bismarck brown, eosin, or vesuvin may be used as a counter stain.

Oxford English Dictionary

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