| Summary: | SUMMARIES. This publication discusses deacidification, the most important paper conservation treatment. It notes the importance of rinsing old prints in water for the process of deacidification. Not only does it remove large quantities of acid substances from paper, but also, by rising out gluing substances, it ensures better deacidification. The lack of possibility of rising books and documents dating from the 19th and 20th centuries which are exposed to mass deacidification was considered a drawback of these methods. The author of this article attempted to find a correlation between the amount of alkali reserve and the pH value of papers after deacidification. He suggests that in the course of preservation, ancient papers should be deacidified until they obtain a pH value of at least 8. The Canadian method of deacidification was also discussed. It involves the placement of acidified sheet in direct contact with paper of alkaline reaction containing calcium carbonate. Under conditions of strong downward pressure and high humidity, ions are exchanged between sheets and, as a consequence, the reaction of the acidified paper improves.
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