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—Szilasi, according to the Lancet, of June 11, has recently proposed a new test for pump water in milk. It is based on the fact that sulphate of diphenylamine is colored blue by the action of an exceedingly dilute solution of a nitrate. As well water always contains more or less nitrates, its presence in milk can be detected. The test is thus carried out: Twenty minims of sulphate of diphenylamine is placed in a small porcelain vessel, and a few drops of the milk to be examined are added to it. If the milk contain even 5 percent. of average well water a blue tinge will gradually distinctly appear. Sulphate of diphenylamine is very cheap, so the test may be readily tried.
New Test for Milk.. JAMA. 1887;IX(2):48–49. doi:10.1001/jama.1887.02400010032008
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