Because little published information is available on the manufacture of goldbeater's skin-the outer membrane of ox intestine and one of the materials traditionally used in the repair of manuscripts on vellum-the author attempted to determine the process empirically. He describes the steps he took to clean, separate, and stretch the membranes, indicating where he made mistakes and what he could have done to prevent them. See also AATA 22-1311 for film on topic.