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Badania technologiczne i konserwacja podobrazia drewnianego epitafium Wierzbięty z Branic

100%

Niedzielska M.

Ochrona Zabytków

1970

issue 2

89-96

The Wierzbięta of Branice epitaph portrait dating back to 1425, now a property of the National Museum, Cracow, represents one of the most ancient pictorial documents of medieval culture in Poland. In 1936 the picture was subjected to essential restoration whose failure consisted in using the sodium silicate (soda liquid glass) as wood preservative for the backing affected by lignicole insects. To obtain more efficient saturation of the board the latter has been cut half-deep of its thickness. In effects of the sodium silicate action the glutin-containing glue fastening the boards together has been hydrolysed. The boards unglued and the paint layer along the former glue joint was held only by means of a canvas strip covering the joint line. As result of impregnation with soda liquid glass the backing of the Wierzbięta portrait underwent strong alkalization that manifested itself by extreme suscebility to changes of temperature and relative air humidity and also by warping of boards. Vehement movements of the board brought forward a threat of damages to painting. Problems involved in the consecutive restoration carried out in 1964 consisted in need to balance the backing which the task, after several investigations and tests, has been completed through its saturation with wax filler applied throughout the whole board thickness. It can be stated now that the method applied has proved reliable as during the five-year period after restoration no movements of board have been observed.

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1 Ochrona Zabytków

1 Niedzielska M.

1 1970

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Badania technologiczne i konserwacja podobrazia drewnianego epitafium Wierzbięty z Branic