37 The Annunciation retable After several unsuccessful attempts to consolidate the brittle paint layer with sturgeon glue from the front, the treatment was changed to Plextol B500 applied locally to the front and an additional total impregnation with Plexisol P550 to the back followed by a heat-sealing process.37 The solvent-based varnish removal and the removal of the mismatched retouching was carried out before this impregnation.38 The success of this measure was significant, in particular regarding the contrast of the colors and the legibility of the details. Filling of lacunae A filler was required to fill large lacunae quickly and precisely. A liquid filler for brush application was developed to provide a replication of the distinctive structure of the canvas without soaking the textile and without the need of extensive manual shaping of the surface.39 Fig. 58, 59: Before and after removal of varnish and mismatching retouches
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