The Collaborative International Dictionary of English v.0.48:

Mercurialize \Mer*cu"ri*al*ize\, v. i.
   To be sprightly, fantastic, or capricious. [Obs.]
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Mercurialize \Mer*cu"ri*al*ize\, v. t. [imp. & p. p.
   Mercurialized; p. pr. & vb. n. Mercurializing.]
   1. (Med.) To affect with mercury.
      [1913 Webster]

   2. (Photography) To treat with mercury; to expose to the
      vapor of mercury.
      [1913 Webster]