Copper foil
Copper foil is a thin adhesive-backed copper tape wrapped around the edge of each piece of glass. The foil is pressed flat, then soldered, and the solder flows along the foil to form a thin, rounded seam. It is the method behind most lamps and fine panels, and it is often called the Tiffany method after Louis Comfort Tiffany, who made it popular in the 1890s.
Compared with lead came, foil makes a much narrower line, so it is better for detailed pictures, small pieces and curved or three-dimensional forms such as lampshades, boxes and suncatchers. Foil is made in several widths, and the width chosen affects how heavy the seams look and how much solder is needed.
Foiled work is strong across the seams but has less flexibility than lead came, so large windows made this way usually need extra reinforcement.