Millon reaction

Mil·lon re·ac·tion

(mē-on[h]'),
the reaction of phenolic compounds (for example, tyrosine in protein) with Hg(NO3)2 in HNO3 (and a trace of HNO2) to give a red color.
[A. N. E. Millon]

Millon,

Auguste N.E., French chemist, 1812-1867.
Millon-Nasse test - for protein.
Millon reaction - used to test for proteins.
Millon reagent - mercuric nitrate and nitric acid as used in the Millon reaction.