| Popis: |
Summary When conservators of art on paper in the USA find it necessary to carry out a bleaching procedure the method most frequently chosen is aqueous light bleaching. Experiments and practical experience with this technique have shown that when applied to modern rag papers it is effective and the results are aesthetically pleasing. The long term efficacy of overall aqueous light bleaching for removal of stains in gelatine sized papers resulting from contact with acidic ligneous materials has now been investigated. Unstained, stained, and treatment control samples were included. Bleaching was camed out under daylight fluorescent tubes; following treatment, and subsequent ageing, the bleached samples were the least discolored of all. Tensile properties of maximum strength, elongation at break, and stiffness were not adversely affected by exposure to light during treatment, and pH was similarly unaffected. Some gelatin sizing was removed from the papers during immersion, but the aqueously light bleached sam... |
