141 The painting “Purgatory” of the Mary retable round shape of the warm bulb, the canvas is stretched, creating a bulge. By using different shaped light bulbs, it is possible to achieve different degrees of stretching. Colour shapers with silicone tips and the hot spatula were used to manipulate the paint flakes during the gluing process. After setting of the glue, the last step was the careful flattening of the local bulge with a sandwich of Viledon® polyester tissue followed by thick and soft wet blotting paper and sandbags. Next followed the varnish removal and removal of mismatched retouches with a Xylene solvent gel (Fig. 213, 214, 216, 217).97 The painting then was re-stretched on the former strainer box which was improved by a back protection, comprised of a plywood panel flush to the surface of the strainer and an additional cushion of a polyester canvas stretched over it. This will slow down any moisture transport through the painting and will provide protection against mechanical impact (Fig. 215). Fig. 213: Purgatory painting, detail before treatment Fig. 214: detail after removal of varnish with xylene based gel mixture – old white fillings exposed after removal of overpaint
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