二酸化炭素処理・酸化エチレン処理がジアゾタイプ複写物に及ぼす影響

摘要

Recently, the value of modern documents as cultural properties has been accepted. However, there are problems in the conservation, preservation and restoration of modern documents because of the variety of materials used for them. Therefore, we should consider of methods for their conservation, preservation and restoration.rnIn this study, we focused on the influences of fumigation on diazotypes which have been used often for engineering drawings. After samples were fumed with carbon dioxide or ethylene oxide, various examinations were carried out.rnThere is little influence of fumigation with carbon dioxide or ethylene oxide on the folding endurance of diazotypes.rnFumigation with ethylene oxide changed the color of diazotype as much as one can recognize by visual observation. However, change of the color of diazotype by treatment with carbon dioxide with moisture was not recognized visually although colorimetry shows that color became darker. Fumigation of diazotypes with carbon dioxide or ethylene oxide caused a smell like that of mercaptan. Surface pH of diazotypes increased by fumigation.rnNeither an ethylene oxide treatment nor a carbon dioxide treatment had little influence on the color and smell of cyanotype. On the other hand, pH increased by ethylene oxide treatment or carbon dioxide treatment.%二酸化炭素処理，酸化エチレン処理ともに，処理後，数週間では，ジアゾタイプの物理強度 に影響はなかった。 酸化エチレン処理を行った場合，ジアゾタイプは目視で確認できる程度に変色した。しかも， 変色の方向性としては，色が薄くつまり図面が不明瞭になる方向への変化であった。二酸化炭 素処理した場合にも若干の色変化があった。 酸化エチレン処理を行うことにより，ジアゾタイプはほとんどの人間が感じる程度の臭気を 発生することが確認できた。また，二酸化炭素処理によっても若干の臭気が発生した。