Factors affecting the Permanency of Paper: Tests with Labelled Sulphur

Abstract

PAPERS of good quality and high alpha-cellulose content can be kept under suitable storage conditions for several centuries. There are, however, differences of opinion on factors affecting storage, and a recent investigation by Langwell1–5 claims that even good-quality papers can become brittle at the edges. He stated that this attacked portion of the paper in old documents and books has a scorched appearance resembling the product of the reaction between cellulose and strong acid. Analyses of these old papers reveals a high sulphate content indicative of attack by sulphuric acid from the atmosphere.

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References

  1. 1

    Langwell, W. H., Proc. Tech. Sec. Brit. Paper and Board Makers' Assoc., 36, 199 (1955).

  2. 2

    Langwell, W. H., Tech. Bull. Brit. Paper and Board Makers' Assoc., 29, 21 (1952).

  3. 3

    Langwell, W. H., Tech. Bull. Brit. Paper and Board Makers' Assoc., 29, 52 (1952).

  4. 4

    Langwell, W. H., Tech. Bull. Brit. Paper and Board Makers' Assoc., 30, 170 (1953).

  5. 5

    Langwell, W. H., Tappi, 38 (9), 190A (1955).

  6. 6

    Interim Report on Air Pollution, 18 (H.M.S.O., 1953).

  7. 7

    Hudson, F. L., Putnam, J. L., and James, H., Tappi, 38 (9), 166A (1955).

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