The Collaborative International Dictionary of English v.0.48:

Silvering \Sil"ver*ing\, n. (Metal.)
   The art or process of covering metals, wood, paper, glass,
   etc., with a thin film of metallic silver, or a substance
   resembling silver; also, the firm do laid on; as, the
   silvering of a glass speculum.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Silver \Sil"ver\, v. t. [imp. & p. p. Silvered; p. pr. & vb.
   n. Silvering.]
   1. To cover with silver; to give a silvery appearance to by
      applying a metal of a silvery color; as, to silver a pin;
      to silver a glass mirror plate with an amalgam of tin and
      mercury.
      [1913 Webster]

   2. To polish like silver; to impart a brightness to, like
      that of silver.
      [1913 Webster]

            And smiling calmness silvered o'er the deep. --Pope.
      [1913 Webster]

   3. To make hoary, or white, like silver.
      [1913 Webster]

            His head was silvered o'er with age.  --Gay.
      [1913 Webster]