A Method for the Aqueous Deacidification of Oxidized Paper

John Bogaard · Hannah R. Morris · Paul M. Whitmore

6 citations0/0 files storedJournal of the American Institute for Conservation

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Conservation Techniques and Studies Cultural Heritage Materials Analysis Building materials and conservation

Abstract

Concentrated aqueous solutions of pH-neutral salts were evaluated for their effectiveness at deacidifying photo-oxidized filter paper. Short immersions in these solutions successfully neutralized acidic paper sheets. However, subsequent rinses to remove excess salt were necessary to prevent yellowing upon thermal aging. Sheets treated with concentrated solutions of calcium chloride showed no significant chemical damage from the treatment and deteriorated more slowly during thermal aging compared with untreated sheets. Sample papers that were given a dilute alkaline rinse after the concentrated salt treatment degraded less upon thermal aging than papers treated with either solution alone. This method of neutral deacidification was also evaluated for use prior to chemical reduction of oxidized paper with sodium borohydride. A treatment procedure involving steps of deacidification, chemical reduction, and alkalization was found to greatly stabilize photo-oxidized papers against thermal aging, as well as to produce a bleaching effect.

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References

1979THE WASHING AND AQUEOUS DEACIDIFICATION OF PAPER 1981Preservation of Paper and Textiles of Historic and Artistic Value II 1998Aqueous Deacidification - with Calcium or with Magnesium?1995The Effect of Oxidation on the Subsequent Oven Aging of Filter Paper 2001Effects of Dilute Calcium Washing Treatments on Paper 1981Washing and Deacidifying Paper in the Same Operation

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2013The use of halide charged interleaves for treatment of iron gall ink damaged papers 2017Influence of acidity on the mechanical stability of retouched Japanese tissue papers during the course of artificial ageing

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