The investigations consisted in the estimation of the effectiveness of protein borates and protein propionates in wood preservation against Coniophora puteana. The estimation was made on the basis of mass losses caused by the test fungus action against treated wood which was subjected to leaching with water. The investigations were performed for Scots pine wood (Pinus sylvestris L.) treated with preservatives containing solutein, albumin or casein and subjected to appropriate thermal or chemical treatment in order to protein denaturation. The objective of the investigations was to develop the method for fixing in wood boric acid or propionic acid. On the basis of the mycological tests as well as boron content in water extracts it was found that the retreatment with tannic acid was the most effective method in respect to active substance leaching. The method let to fix up to 95% of boric acid in treated wood despite the intensive leaching.

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