Deterioration Phenomena of Urushi Films : Combined Effects of Ultraviolet Radiation and Water

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  • SHIMADZU Yoshiko
    元独立行政法人文化財研究所東京文化財研究所修復技術部伝統材料研究室
  • KAWANOBE Wataru
    Department of Restoration Techniques IAI, National Research Institute for Cultural Properties, Tokyo

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  • 紫外線と水分が黒漆塗膜の劣化に及ぼす相乗的な影響
  • シガイセン ト スイブン ガ クロ ウルシ ト マク ノ レッカ ニ オヨボス ソウジョウテキ ナ エイキョウ

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Urushi coatings are traditionally used for wooden structures. Discoloration and cracking of the surface lead eventually to the total loss of the paint layer. This paper examines the deterioration phenomena of kuro-urushi and ki-urushi films. We focussed on the effects of ultraviolet radiation and water soaking on the deterioration. Artificial ageing of the kuro-urushi films on wooden panels was carried out with a fademeter and water soaking. The drying techniques involved natural evaporation and wiping of the excess water with cotton fabric. The samples were examined with scanning electron microscope and gloss meter.<BR>Kuro-urushi films deteriorated faster than ki-urushi. Accelerated the deterioration of both urushi films, leaving numerous cavities on the surface. The combination of water with ultraviolet radiation had a greatest effect on the process, resulting in loss of the original surface.

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