EN
The aim of the article is to show a developmental line in the conservation of easel paintings derived from craftsmanship through the conservation art to conservation as a branch of science. The answer to the question what methods and what chemical agents were used in the past iis difficult. This difficulty is, in the first place, the result of a small number of source materials that are in our posession. The course of repairs and renewals of such financially and factually insignificant objects as easel paintings was never recorded At the same time the maintenance of professional secrets for a long time still intensified this difficulty. Despite difficulties just mentioned studies on the history of conservation .are continued and ascertain us that without theoretical and practical achievements of our forerunners present attainments of the conservation of works of art would not have been possible.