A provenance study of Japanese lacquer "Urushi"

通过测量乌鲁士漆膜中锶的同位素比值(锶-87/锶86)，首次证明它能够识别日本岛屿的天然漆(乌鲁士)和中国的天然漆。漆树生长的土壤中锶的同位素比保存在汁液中，直到乌鲁什漆膜形成后才发生同位素分馏(同位素比的变化)。该方法适用于含有红色颜料的薄膜。对该考古遗址的日本漆器进行了分析，首次从该遗址生长的漆树中提取了漆液，并对其进行了分析。成岩作用不影响埋藏文物的同位素比值，该方法有可能应用于考古遗迹。

It was shown for the first time to be able to identify the natural lacquer (Urushi) of the Japanese Islands and that from China by measuring the isotopic ratio (Sr-87/Sr-86) of the strontium contained in the Urushi paint film. Isotopic ratios of strontium in the soil where the lacquer tree grew were preserved in sap, and the isotopic fractionation (changes in isotope ratio) did not occur until the Urushi paint film was formed. The method is applicable to the film containing a red pigment. The Japanese lacquer of the archaeological site of the Late and the Final Jomon period was analyzed, and it was shown clearly for the first time that sap was extracted from the lacquer tree grown at the site. The diagenesis did not influence the isotopic ratios of relics that had been buried, and the method is possible to apply to archaeological remains.