ブックタイトルConservation and Restoration of Western Paper

概要

Conservation and Restoration of Western Paper

poor quality wove paper was stained bycontact with the black fabric neckline(Photos 23a, b). A 4% concentration ofgellan gum dissolved in alkaline water, withthe addition of saturated calcium hydroxideto pH 8.0 was prepared and cast into a onecm thick layer.Gellan can be easily trimmed with ascalpel into precise shapes for local stainremoval, alleviating the need for producingmasks to shield sensitive media. The stainwas traced onto Mylar and the gellan gumwas trimmed to size. The gel was placedon the stain and covered with Mylar andweights for ten minutes then removed. Thepaper was highly absorbent, and solubledegradation components were drawn upinto the gel, and also moved down into theblotter placed beneath the treated area. Thesurface texture was unchanged (Photos24a-d). The process was repeated on thestains until they were almost completelyreduced (Photos 25a,b).Gellan gum has also successfully beenused to reduce staining on silver gelatinphotographs. Two 570 cm long panoramasof Niagara Falls are currently being treatedat CCI (Photo 26). Because of thesolubility of the deteriorated emulsion, amore rigid 3% gellan gum was prepared ina calcium acetate solution, and an interleafof thin Japanese paper was used betweenthe surface of the photograph and the gellangum (Photo 27). The gel was trimmed intocircular shapes to avoid leaving hard-edgedtide lines. Stains were drastically reduced as74Photo 23a Overall view before treatmentPhoto 23b Overall view after treatmentPhotos 23a-b (Untitled) Trudeau Paper Dress, 1968, photomechanical print on wove textured paper, 84.0 x 49.9 cm,Library and Archives Canada, MIKAN 3000168