Because stained glass can last literally hundreds of years, most stained glass windows have to be restored at least once in their lifetime. The deterioration of stained glass is a completely natural and normal process, though there are certain factors which can lead to its acceleration. Problems with the leading and actual construction of the panels can cause stained glass windows to sag, bow, crack, and lose their beautiful color and appearance. This, unfortunately, was the case for the First United Methodist Church in Del Rio, Texas.
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