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Conservation and restoration of cultural heritage are the objects of great  interest worldwide. For setting the correct methodology for the procedures of  the restoration it is very important to have the right information about the  state of the object and the characteristics of the original materials. The  basis of our examinations were clay products (samples of bricks, terracotta  and clay roof tile) from the middle ages, the fortress in Bac. The following  methods were used: x-ray diffraction, classic chemical analysis, SEM-EDS,  Hg-porosimetry and dilatometry. Based on the used methods, mineral  composition, temperature and regime of firing and textural properties of the  examined materials were determined. The degree of destruction of examined  materials was also identified, in order to find compatible materials for  future techniques of conservation and restoration.

Historical materials from the medieval fortress Bac