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Silver Bath

The Standard Electrical Dictionary by T. O'Conor Sloane (1892)

A solution of a salt of silver for deposition in the electroplating process.

The following is a typical formula:
  Water,              10.0   parts by weight.
  Potassium Cyanide,  5      "        "
  Metallic Silver,    2.5     "       "

The silver is first dissolved as nitrate and converted into cyanide and added in that form, or for 2.5 parts metallic silver we may read:   Silver cyanide,   3   parts by weight.

While many other formulas have been published the above is representative of the majority. Other solvents for the silver than potassium cyanide have been suggested, such as sodium hyposulphite, but the cyanide solution remains the standard.