Meyer reagent

Mey·er re·a·gent

(mī'ĕr),
a solution of phenolphthalein with sodium hydroxide, in water (glass-distilled); in the presence of minute traces of blood, the solution becomes purple or blue-red.
[W. Meyer]

Meyer,

Willy, U.S. surgeon, 1854-1932.
Meyer reagent - a solution to detect minute traces of blood.
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