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Abstract
A standard qualitative assay for glue in paper (TAPPI T 504 om-84) was adapted for use as a semiquantitative colorimetric procedure to determine changes in the amount of gelatin size due to treatments. The modified method is described in detail. Cellulose, alum, and proteins that do not contain hydroxyproline do not interfere with this assay. It has been used to document changes in the gelatin content of modem rag papers due to washing, aqueous light bleaching, and enzyme treatment. The results indicate that a significant fraction of the gelatin size is removed by immersion of the papers in Mg(HCO3)2 bathing solution at room temperature. Paper conservators may want to consider this phenomenon as a factor when they plan aqueous treatments for paper-based objects.