In recent years, interest in the preservation and restoration of photographs has increased. One reason is the rise in the number of museums and other institutions that collect and preserve photographs as works of art. Old photographs are valued as academic and research materials in a variety of fields, including history, and tend to be cherished as cultural assets. Attention is being given to old photographs that have not been in the spotlight much in the past. This paper underscores the importance of photographs as cultural assets and contrasts the changes in Hofu, Yamaguchi Prefecture that have taken place over the past century using the photo album “Gyokei Kinen Shashincho” created in 1922 (Taisho 11).

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Both crystal violet and a cyanine dye were incorporated into Nafion sheets by electrostatic co-adsorption method. A dye-mixed Nafion sheet obtained under certain conditions exhibited a deep reddish-purple metallic luster. This color tone was not a simple color mixture of metallic luster by each single dye, suggesting that the aggregate state of each dye was modified by the co-adsorption.

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