An interesting example of secondary action is shown by the common technical process of electroplating with silver from a bath of potassium silver cyanide.
ELECTROPLATING, the art of depositing metals by the electric current.
Reference must be made to the textbooks (see Electrochemistry) for a fuller account of the very varied solutions and methods employed for electroplating with silver, gold, copper, iron and nickel.
It should be mentioned here, however, that solutions which would deposit their metal on any object by simple immersion should not be generally used for electroplating that object, as the resulting deposit is usually non-adhesive.
A cyanide bath, as used in electroplating, would dissolve the gold, but is not suitable for refining, because other metals (silver, copper, &c.) passing with gold into the solution would deposit with it.
ELECTROTYPING, an application of the art of electroplating to typography.