Removal Of Clippings Ordinarily, the application of a single enzyme for treating assorted types of manufactured and homemade protein-based adhesives is likely to provide varied results. While analysis of each adhesive and selection of a specific enzyme is the usual procedure, the use of one enzyme in this case proved satisfactory. The selection of P-4630 involved a review of other enzymes currently used at the National Gallery of Art, New York University and the Canadian Conservation Institute. In some instances, the optimum conditions for using these enzymes were outside our technical capabilities and could not be used. Several logbooks had scrap papers applied with starch adhesives, and although amylase enzymes were studied, we did not attempt these treatments as part of this project.
Paper fills .
Four logbooks had lacunae and required paper filling and setting with pasted or heat-set tissues, the latter being set by activating with ethyl alcohol on swabs. The restoration papers used for filling were Kitikata, mulberry and Kizukishi, and the technique for doing paper fills involved the making of toned papers with finish, bulk, and opacity similar to the log papers. These laminated papers, once cut, torn and fitted, could be used to make accurate matches. The development and application of filling methods were carried out with the assistance of Jean Smith, Laboratory Assistant. The majority of fills and replacements of margin losses were fixed in place using Bookmaker's tissues, which have an acrylic adhesive coating.