Średniowieczne witraże z Kościoła Mariackiego w Krakowie - problemy konserwatorskie

The presbytery of the church of the Holy Virgin Mary in Cracow contains 119 stained glass panels which have survived from the last quarter of the fourteenth century. An examination of the objects has revealed that their poor condition is caused by the corrosion of the inner and outer sides of the glass as well as by improper earlier renovation. The recently completed treatment consisted of two stages: 1. cleaning the panels, which involved the removal of dirt and loose corrosion layers, fixing the painting layer, framing and installing isothermal glazing; 2. the removal of the outer corrosion crust from the glass, and the replacement of traces of previous incorrect renovation. This operation was conducted without dismantling the panels.