Materials science research on histrical changing of materials and techniques of anciet metal wire

本研究旨在揭示日本一处考古遗址出土的古代金线的材料和制作工艺，并探讨其在日本的历史。日本生产的现代金线，是用表面有薄金的基膜制成的。它与古代的金丝完全不同。日本出土的古代金线是一种扭带式的线。这是一个“金银丝”，这是用来injeetary指定由金属丝制成的装饰品。由于这种金线的成分超过95%的金和4%的银，这种材料足够软，使它变得很薄。扫描电镜观察告诉我们这个线的细节。首先，制作厚度约为15μm的金箔。用一种剪刀或剪刀从箔上剪下宽度约为300μm的窄条。精细地，将条带扭曲成具有圆形横截面的细中空管，其具有约150μm的直径。一个单一的接缝运行在一个螺旋线周围。空心线容易变形。虽然说它原本是以丝线为核心的，但有机物质的痕迹已经完全消失了。由多层金箔制成的特殊金耳环被发现。这种技术被命名为“金箔层技术”。这是非常有趣的薄金箔是第一个重要阶段的古代金线出土于日本。

This research focuses to reveal the materials and the manufacture technology of an ancient gold wire excavated in an archaeological site in Japan, and also treats its history in Japan. Japan produces modern gold thread, which is made of the base film with thin gold surface. It is totally different from ancient gold wire. Ancient gold thread excavated in Japan was a strip-twisting wire type. This is the one of"filigrees", which is used injewelry to designate ornaments made from metal wires. Since the compositions of this gold wire were over 95 % gold and 4% silver, the material was soft enough to make it thin. The SEM observation tells us the details of this wire. Firstly, a gold foil, about 15μm in thickness, was made. Narrow strips, about 300μm in the width, were cut out from the foil with a kind of shears or scissors. Finely, a strip was twisted into a fine hollow tube with a round cross-section, which had a diameter of about 150μm. A single seam runs in a helix around the wire. The hollow wire shows deformation easily. Although it is an idea that it originally had silk threads as a core inside, the traces of organic materials were totally disappeared. The special gold earring made by layered gold foils was discovered. This technique was named "gold foil layering technique". It is very interesting thin gold foil was the first important stage of ancient gold wire excavated in Japan.