Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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alkaline reserve

A buffer, or reserve, of an alkaline substance added to a paper for the purpose of counteracting any acid which may be introduced into it subsequent to DEACIDIFICATION . Soaking paper in a solution of calcium bicarbonate or magnesium bicarbonate adds a small amount of calcium or magnesium carbonate which neutralizes any acid present and also provides a reserve to counteract acid which may enter the paper at some future time. (The bicarbonates are converted to the carbonates during the drying of the paper, with the liberation of carbon dioxide.) The treatment is effective only as long as free alkali remains. Papers which are to remain acid free for long periods of time, e.g., 500 years, should have approximately 3% precipitated carbonate by weight of paper. (198 )

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