Rebuilding a Cracked Stained Glass Window
A stained glass window looks like a single picture, but it is really a puzzle of small colored pieces. Each piece is held in place by a thin strip of lead called came. When a window cracks or begins to sag, a restorer is called in to make it whole again.
The work starts with careful records. Before touching a single piece, the restorer photographs the window and lays paper over it to make a rubbing of every line. These records show where each piece belongs, so nothing is lost or misplaced during the repair.
Next, the window is taken out and laid flat on a table. The restorer removes the damaged pieces and cleans the ones that can be saved. Then comes the hardest part. A new piece of glass must match the old one in color, thickness, and even the way it lets in light. The restorer cuts it to the exact shape of the pattern, and fits it back between the lead strips.
At each joint where lead strips meet, the restorer melts a little metal called solder to hold them together. Finally, a soft putty is pressed into the edges to keep out wind and rain. If the job is done well, visitors never notice the repair at all.