Paper made from wood pulp is not necessarily less durable than a rag paper. The ageing behavior of a paper is determined by its manufacture, not the original source of the fibres. Furthermore, tests sponsored by the Library of Congress prove that all paper is at risk of acid decay, because cellulose itself produces formic, acetic, lactic and oxalic acids.
Try to answer this question if possible (otherwise reply "unanswerable"): Who sponsored the tests that show that all papers are not subject to acid decay?
unanswerable