56 The Holy Cross retable The applied ground layer was analytically determined as a mixture of calcium carbonate and animal glue. It was spread by brush over the entire surface including the attached mouldings, subsequently covering all nail heads of the making of the construction (Fig. 83). For gilded areas, the preparation was applied three times thicker than for polychrome flat surfaces. No traces of grinding or amendment of the applied preparation are visible. Gilding Gilded surfaces are decorated by water gilding. For that an extremely thin layer of brownish bole (poliment) had been applied, subsequently the gold leaf was applied and burnished. Fig. 85: Detail of the right column; dark blue smalt is contrasting the gilded ornaments
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