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Mass deacidification is a term used in Library and Information Science for one possible measure against the degradation of paper in old books (the so-called "slow fires"). The goal of the process is to increase the pH of acidic paper on a large scale. Although acid-free paper has become more common, a large body of acidic paper still exists in books made after the 1850s because of its cheaper and simpler production methods. Acidic paper, especially when exposed to light, air pollution, or high relative humidity, yellows and becomes brittle over time.〔Cheradame, H et al. (2003).Mass Deacidification of paper and books: I: study of the limitations of the gas phase process. ''Restaurator: International Journal for the Preservation of Library and Archival Material'', 24, 227.〕 During mass deacidification an alkaline agent is deposited in the paper to neutralize existing acid and prevent further decay.〔Lienardy, A. & Van Damme, P. (1990).Practical Deacidification, ''Restaurator: International Journal for the Preservation of Library and Archival Material'', 11,2.〕 ==Current services== There are several commercial deacidification techniques currently on the market. : *The BookKeeper process is a non-aqueous, liquid phase process that uses magnesium oxide.〔Porck, H. (1996). Mass deacidification. An update of possibilities and limitations. (BookKeeper ). URL accessed December 1, 2007.〕 BookKeeper is available through Preservation Technologies, L.P. with plants in the U.S., Spain, Japan, Poland, The Netherlands, and South Africa.〔(【引用サイトリンク】PTLP: Home )〕 : *The CSC Book Saver uses carbonated magnesium propylate for deacidification.〔Banik, G. (2003).Mass deacidification technology in Germany and its Quality Control. ''Restaurator: International Journal for the Preservation of Library and Archival Material'',26, 64.〕 It is available through Conservación de Sustratos Celulósicos S.L. (CSC) (Barcelona, Spain).〔(【引用サイトリンク】CSC )〕 : *The Papersave process was developed by Battelle Ingenieurtechnik GmbH and is, therefore, sometimes referred to as "the Battelle Process". The process uses magnesium titanium alkoxide.〔 It is available in Europe through Nitrochemie Wimmis (Wimmis, Switzerland) under the name of Papersave Swiss〔http://www.nitrochemie.com/pdfdoc/papersave/papersave-swiss-brosch_en.pdf〕 and the Zentrum für Bucherhaltung (Leipzig, Germany). : *The Wei T'o process uses methoxy magnesium methyl carbonate, or isopropoxy magnesium isopropyl carbonate,〔Porck, H. (1996). Mass deacidification. An update of possibilities and limitations. (Wei T'o and Sable ). URL accessed October 5, 2007.〕 and new products are coming out in 2008. Wei T'o is less commonly used for mass deacidification treatment than for single item deacidification. Wei T'o products are available through Wei T'o Associates Inc.(Matteson, USA).〔(【引用サイトリンク】Wei T'o Index - Cover Page )〕 BookKeeper, CSC Booksaver, Papersave and Wei T'o are also available as a hand held sprays. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「mass deacidification」の詳細全文を読む スポンサード リンク
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