Thionine
noun
1.
a crystalline derivative of thiazine used as a violet dye to stain microscope specimens
2.
any of a class of related dyes
thionine thi·o·nine (thī’ə-nēn’, -nĭn)
n.
A dark-green powder that turns water purple when mixed in solution, used as a basic stain in histology for chromatin and mucin because of its metachromatic properties.
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