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To the Editor:
—No doubt it is a common annoying experience for physicians to find their white cell solutions on standing contaminated with molds and especially yeasts. It has been experimentally proved that gentian violet even in high dilutions possesses the power of checking the reproductive mechanism of bacteria. I have applied this by adding one or two drops of gentian violet to the white cell solution (150 cc. of 0.5 per cent acetic acid) and have found no contaminating yeasts or molds after standing for a few months at room temperature.
Trumper M. PRESERVATION OF WHITE CELL SOLUTIONS. JAMA. 1926;87(1):50. doi:10.1001/jama.1926.02680010050025
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