As the window consisted of panels representing 20 different subjects, no one was exactly sure which panel went where. Luckily, the National Gallery of Ireland had cataloged this window. One of their slides was used to create a three-foot-tall print showing the original window. This gave us the information we needed for the next harrowing stage.
All the many fragments of broken glass had to be laid out and matched with the remnants of the removed panels. Several months of painstaking jigsaw work let us place all of the fragments in our possession. However, there were still missing pieces, and, even of those we had, some were damaged beyond recognition.
We took rubbings of the stained glass to give us a plan for each panel. Then we started to remove the 150-year-old lead. The perished lead, no stronger than paper, easily came away from the glass.
Each piece of glass had to be cleaned dry by rubbing them with wire wool; the old, hardened putty at the edges of the glasses was gently chipped away. Some of the glass had such a thick layer of grime and pollution that they were cleaned with an acid solution.