How to Dry Armor Black Japanese Lacquer From the Kofun Period

<p>Currently, many of the 236 items that are considered to be traditional Japanese crafts are a combination of metal and lacquer, such as Nanbu Tekki, and these products are also familiar to us. Therefore, when examining the history of the combination of metal and lacquer, it is found from the analysis result¹⁾ that the armor was already painted with black lacquer in the Kofun period 1600 years ago. In addition, Suenaga²⁾ and Kobayashi³⁾ applied the lacquer applied to the armor of the Kofun period after binding it with a strap, and the drying method is the same as normal lacquer. It is said that it is due. However, although lacquer does not adhere to metal unless it is baked and dried, if it is baked and dried after binding with a string such as deer leather, the leather string will deteriorate due to heat, so there is a trade-off between workability and corrosion resistance of leather binding. It turns off. Therefore, in order to determine the truth of these, we conducted a study this time. As a result, the surface performance was overwhelmingly higher when it was baked and dried, and the remnants of it were glimpsed in the dents of the armor. In addition, as a result of non-destructive color measurement of the black lacquer armor using a spectrocolorimeter, a profile of spectral reflectance with characteristics derived from seizure was obtained. Furthermore, it was found that there is a possibility that the baking and drying method can be adopted without thermally deteriorating the strap by switching the lacquering process and the leather binding process. From these facts, in order to ease the trade-off between workability and corrosion resistance of leather binding, the baking lacquer technique was adopted at the part molding stage, which is the opposite of the established theory, and then it is possible that leather binding may be performed.</p>