31 The Annunciation retable A total of three filler systems were developed, designed to allow for maximum customisation according to the respective damage: injectable filler for undercut holes, trowelable fillers for deep voids and topcoat fillers for a smooth surface. The binder used was a combination of acrylic resin Plexigum PQ 611 and animal glue as Plexigum was used for the wood consolidation work. The fillers with cork granulate (in two particle sizes and various proportions), hollow phenolic microspheres, and chalk were prepared as standard mixtures (Fig. 38-41). The injectable filler was primarily required for those parts of the eroded wood substance where the polychromy and gilding were left without support, but to which the supporting filler could not be applied to with a spatula. This compound could be injected through exit holes (Fig. 37).36 The retouching was carried out using pigments and acrylic resin Paraloid B72 as a binder, and only prominent defects were minimised. Covering the primer-visible surfaces with the appropriate local colour achieved a significant calming of the surfaces (Fig. 34, 42, 43). The aim of the retouching was to calm the surfaces by accentuating the values of the local colours. Whereas wood and gold are close together in colour, the contrast between the visible preparatory layer to gold, wood, Fig.36: Right gable; reconstruction of the broken corner
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