Enamelling processes are of two kinds, either cold enamelling or stoving. If the enamel is not to be stoved, the metal must be smoothed as much as possible with the file and with a fine emery cloth. A very thin coat of enamel should then be applied, and after it is dry it should be smoothed with the finest glasspaper; two more coats may then be given, each coat being smoothed with glasspaper. Up to this stage the object has been to obtain a perfectly uniform surface and not to produce a glossy coat. The last coat may consist either of the best copal varnish or of the enamel paint, and it should dry with a lustre. If stoving is employed, a black stoving enamel must be used; the method of applying the enamel is practically the same in both cases.