Abstract
Alkaline papers are used for preference in the conservation field, except with alkali-sensitive materials, since it is supposed that alkaline paper has beneficial effects for the preservation of acidic paper. The moist heat ageing of paper by the commonly used method of suspending paper in an oven was compared with an insertion method in which the test paper was inserted into books made of other types of paper. Alkaline paper increased the durability of acidic paper. However, some types of acidic paper were severely discoloured by insertion into a book of alkaline paper. This result shows that neutral paper might be preferable for use as envelopes for acidic paper, and that moist heat ageing by the insertion method is a valuable technique for the evaluation of conservation paper.
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