Many times we solder zinc 1/4" outer bar onto a window as a framework to strengthen it. Raw glass panels are usually very weak but adding zinc really increases their strength. Sometimes that zinc edge is the only framework that is used to hang the completed panel and sometimes the entire piece gets put inside a wooden framework to hang or stand as a room divider or in a window as a decorative element. Putting zinc on a window is a technique that all glass artists, both lead came and copper foil enthusiasts use. It is a basic skill that all flat glass artists need to learn.
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