In stained-glass making, what is the name for joining glass pieces with copper foil and solder?

Joining glass pieces with copper foil and solder is called the copper-foil technique.

In this method, each cut piece of glass is wrapped around its edge with narrow adhesive copper foil. The wrapped pieces are assembled, and solder is applied along the foil seams to create a continuous metal structure. The method became especially associated with the work produced by Tiffany Studios in the late 19th and early 20th centuries.

Copper foil allows makers to join small, irregular, and three-dimensional pieces that would be difficult to support with traditional lead came. It is therefore widely used for lampshades, small ornaments, and sculptural stained-glass objects as well as windows.

The technique is not the same as the came method, in which glass pieces fit into grooved lead strips. Grisaille, meanwhile, describes monochrome painted glass rather than a method of assembling pieces.