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The Royal Society Exhibition
At a conversazione given by the Royal Society, many exhibits of medical interest were shown. Mr. A. A. King showed the application of ultraviolet radiation from a mercury vapor lamp to the detection and estimation of minute quantities of arsenic. When a mercury-arsenic stain on a piece of filter paper sensitized with mercuric chloride is examined by means of ultraviolet rays the unchanged mercuric chloride fluoresces blue, while the mercury-arsenic stains stand out as a black disk. Arsenic stains, which are quite invisible in ordinary light, may be revealed in this way, and it is said to be possible to detect and estimate quantitatively amounts of arsenic as small as 0.00001 mg. Impurity in distilled water is also revealed by fluorescence in ultraviolet rays, and it has not yet been found possible, even with the most refined methods of distillation, to prepare water that does not
LONDON. JAMA. 1927;89(3):218–219. doi:10.1001/jama.1927.02690030050022
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