Most people looking at a stained glass window notice the color first. The metal lines that hold it together get almost no attention, yet they decide whether a panel stays flat for generations or sags, bows, and cracks after years of heat and cold. Those lines are glass came, and understanding it is the fastest way to judge the quality of any leaded window. Whether you are commissioning a new piece for a church, restoring a family heirloom in a front door, or specifying glass