Hans Christian Gram
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Hans Christian Joachim Gram was a Danish bacteriologist who developed the Gram stain, still a standard technique to classify bacteria and visualize them under a microscope.
Hans Christian Gram by Hansen & Weller
Crystal violet
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Crystal violet or gentian violet, also known as methyl violet 10B or hexamethyl pararosaniline chloride, is a triarylmethane dye used as a histological stain and in Gram's method of classifying bacter
Hans Christian Gram
…imperfect; but it is hoped that also in the hands of other investigators it will turn out to be useful." A Gram stain is made using a primary stain of crystal violet and a counterstain of safranin. Bacteria that turn purple when stained are termed 'Gram-positive', while those that turn red when counterstained are…
Solid crystal violet
Crystal violet in aqueous solution
Ditto machine duplicated tests papers, inked with crystal violet.
Bacteria stained with crystal violet