Non-destructive test on polished surface of Japanese sword

Non-destructive test focus on polished surface of Japanese sword

Japanese sword is polished  with special stones by traditional method  to appreciate the beauty of the steel  on its polished surface. There are many special and hidden polishing technique  to show different activities  of the blade.
We must understand “polishing” before understanding the blade itself. However, it is very difficult to determine  by visual examination.
Therefore,  we  try to resolve these issues using the latest technologies to investigate the  polished surface of the Japanese sword.