To apply or coat (something) with mercury (noun sense 1.1) or a preparation containing mercury; specifically (obsolete, rare), to apply to (the face) a preparation of mercury to beautify it.
[…] I knovv, you ha' not a finger, but is as long as my quiuer (couſin Mercvrie) vvhen you pleaſe to extend it. […] Alas, your palmes (Ivpiter knovves) they are as tender as the foot of a foundred nagge, or a ladies face nevv mercuried, the'ile [they'll] touch nothing.
In proceeding to elucidate my process, I will divide it into six parts, the first three of which will be confined to plate cleaning; the fourth to coating with chemicals; the fifth to mercurying and chemicals, and the sixth to finishing with general remarks.