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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