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The objectives of the specific research of identical incunabula on a long-term basis deposit in different environmental conditions were to find out to what degree the different quality of ambient air was reflected in degradation of paper. The Selection of identical incunabula from the collections of the National Library in Prague, the South Bohemia Research Library in Ceske Budejovice and the library of the Regional Museum in Teplice, was performed according to the Incunabula Short Title Catalogue database, in which an unique numeric identifier of the bibliographic record ISTC is assigned to each of the publications, which enables to interconnect all preserved copies. SurveNIR measuring system was used for comparison of naturally aged paper, in view of investigation of effects of dust particles and gaseous pollutants on historical paper, attention was paid also to protective elements and damages of bookbinding. All recorded data - outputs of spectrometry measurements of mechanical and chemical properties of paper, microscopic snapshots of the analyzed places, and photographic documentation, are deposited in ResIS (Restoration Information System). No verifiable correspondence between degree of damage of historical paper and closeness of book block was found, it was evident from the results of measurement that sub-micron dust particles are able to permeate even among sheets of the book block. [ABSTRACT FROM AUTHOR]

The article deals with problems of papers degradation by reason of acidity with reference to the legal duty of libraries to preserve papers funds for the future generations. In lots of efforts to protect its collections, the Moravian library study all the preservative technology including of the mass deacidification technology. The merit of this text is a summarization of project efforts of the Moravian library and the National archives make up the papers protection to deacidification technology in the Czech Republic. The article warms that the acidity of paper research and its conservation depends fully on political environment and the sufficient financial resources. In short there is technique demonstrated that was considered as a purchase for libraries and archives in the Czech Republic. [ABSTRACT FROM AUTHOR]