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Millon's testa test for the presence of protein in a mixture, involving the use of Millon's reagent which contains mercuric nitrate and nitrite. On heating a proteinaceous solution with a few drops of Millon's reagent (using a fume cupboard) a purplish precipitate is formed. The test is less commonly used today because of the danger associated with handling mercuric salts, the BIURET REACTION being employed instead.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005