VÄRMEAKTIVERADE TISSUES PÅ TRANSPARENT PAPPER En jämförande studie vid revlagning

Abstract

Works on transparent paper, also commonly known as tracing paper, have been described as ephemeral or temporary working documents and they usually number large quantities in archival and museum collections. They have therefore previously been considered of lower priority and can be found in poor condition due to a lack of treatment or suitable storage prospects. In addition, transparent paper can be very sensitive to moisture and reacts by deformation or loss of transparency. Due to the volume of these works and the necessity of treatment, there is a call for simple and efficient conservation methods. A common solution in archives for the treatment of water-sensitive works on paper has been the use of heat-activated tissues as they can be applied without the introduction of solvents. There is little published about the use of heat-activated tissues on transparent paper and is mentioned only briefly in existing literature. This thesis aims to select five commonly used heat-activated tissues and test their compatibility with transparent paper during mending. Compatibility is evaluated through the study of certain properties such as adhesion between the tissue and the paper substrate, transparency and gloss of the tissue, as well as the ease of its removal without the use of solvents. Examination in ultraviolet (UV) light is used to ascertain whether the adhesive has been fully removed. Tested adhesives and tissues include Aquazol 200, Aquazol 500, Beva 371, Lascaux 498HV:303HV and Filmoplast R. The study shows that tissues made with Aquazol 200 and 500 had lower adhesion to the type of transparent paper used and showed a high gloss that increased the visibility of the repair. The Lascaux tissue showed a promising outcome but was at a disadvantage due to the method of its preparation resulting in an uneven adhesion. Filmoplast R gave a flexible albeit visible repair and showed sufficient but questionable adhesion properties. Overall, the tissue that performed the best appeared to be Beva 371 with good adhesion, high transparency and low gloss. During removal, it could be easily excised with applied heat. Each tissue showed properties that can be advantageous for use on transparent paper.