BRASS′ING

Syn. Bra -coating. 1. Copper-plates and copper-rods may be covered with a superficial coating of bra by simply exposing them, in a heated state, to the fumes given off by melted zinc at a high temperature. The coated plates and rods are rolled into thin sheets or drawn into wire. The spurious gold wire of Lyons is said to be made in this way. 2. Ve els of copper may be coated with bra , internally, by filling them with water strongly soured with hydrochloric acid, adding some amalgam of zinc and cream of tartar, and then boiling the whole for a short time. This plan may be usefully applied in certain cases to copper boilers in laboratories, and to other purposes. 3. By the electrotype (which see ).