Abstract: An improved foil for stained glass assembly is disclosed. This improved foil is unique in that it includes an indexing reference to assist in the precise placement of the foil on the edge of a piece of stained glass. After foiling of numerous pieces of stained glass, they are butted to one another and soldered together along their contiguous seams. The precise placement of the foil on the edge of the glass insures that the solder bead between such contiguous pieces is uniform, thus insuring an esthetically attractive and structurally superior article.