No.8（2013）22.Basic study on issue of change of color of the black lacquer film

Yoshimi Kamiya, Shinji Nishimura

  Oriental lacquer, called urushi, is a natural polymer that has been in use since ancient times. Recent studies have made it clear that oriental lacquer films are weak against ultraviolet irradiation and that exposure to ultraviolet rays light could cause these films to deteriorate (e.g. flaking, loss in gloss, dulling, or cracking might occur). There are many research data of ultraviolet irradiation using samples of a glass plate coated with a single lacquer coating film. Therefore, the influence of ultraviolet irradiation was verified by the change in surface profile of the polished black lacquer film under the assumption that real lacquer ware had a four-layer structures. The purpose of this study is determine the mechanism behind the complicated deterioration phenomenon of the natural polymer.

Keywords
Black lacquer, Ultraviolet irradiation, Deterioration

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