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EN
Basing on the results of laboratory studies and works carried ouit on the building, the present condition of paintings and bricks in S t John’s Church art Gniezno has been described. Attention has been paid to the extent of th e sa linity of th e (Structure, sealing of the paintings, po ssibility of w a x extraction, cleaning and fixing of polychromy. The ability of fluids to migrate into the -pores of the paintings and bricks has also been examined. As a result of the works done a programme of conservation procedure has been prepared, including a performance technique and the best agents to be used. Comprehensive studies have shown that Sandsteinverfestiger H, a silicone product made by Wacker, is most suitable for the preservation of the building.
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EN
The article discusses the causes o f the damage and heretofore methods o f the conservation o f brick walls and red ceramic; it presents m ethods universally used in conservation and in the Institute for the Conservation o f Architectonic Elements and Details. The authors examine the structural reinforcement o f ceramic, the supplementation o f gaps, and the reconstruction o f the objects, as well as problems connected with the socalled binding of walls (the filling o f gaps in the mortar). It has be found that the method o f exchanging damaged bricks for new ones can be replaced by suitable conservation operations, which structurally reinforce the bricks, supplement the existing gaps by means o f brick-alike mortars whose physical and mechanical properties resemble brick, and the application o f suitable mortar (also with similar properties) for the purposes o f binding the walls. The article contains the programme o f research conducted by the staff o f the Institute for the Conservation of Architectonic Elements and Details, made possible by a grant funded by the Committee for Scientific Research ( 1993— 1995).
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