| Abstract: | Summaries. The sensitivity of parchment and vellum to moisture and the dependence of these skins on moisture in order to maintain their physical and mechanical characteristics is well known. In fluctuations of moisture from one extreme to another, however, the skins are vulnerable to several alterations of a biological or chemical nature. The use of polyethylene glycol of low molecular weight for the treatment of parchment and vellum permits the maintenance of hygro-metric constants and, therefore, the control of the physical, chemical and biological characteristics of these untanned skins. |
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