Materials
Gypsum plaster; colourless glass (some with a greenish tint); coloured glass (two shades of green, two shades of blue, three shades of orange, yellow, two shades of red flashed glass); wood, metal
Technique
The stucco lattice of this window is probably a cast of the latticework of window IG_366. As with the original, coloured pieces of glass were placed on the back of the openings in the stucco lattice and embedded in a thin (2–3mm) layer of stucco. In contrast to IG_366, there are no signs that the pieces of glass were fixed onto the lattice with an adhesive before embedding. To improve the adhesion of the thin layer of stucco on the latticework, the back of the stucco panel was roughened with a serrated tool. The thickness of the stucco panel is c.40mm and held in a wooden frame of the same thickness.
The coloured glass is 3–4mm thick, slightly thicker than the colourless glass (1–2mm). Some of the pieces of glass show elongated bubbles, suggesting that the glass sheets from which the pieces were cut were mouth-blown. The pieces of glass were cut roughly according to the design of the latticework using a glass-cutter. Scratch marks along the edges of several pieces of glass bear witness to this process.
State of Preservations and Restorations
The front of the window shows continuous, diagonal cracks and losses in the latticework. On the back, there are defects in the thin stucco layer and glass losses along the fissures. The window shows no signs of previous restorations.