High-class Japanese Sharpening Stone

Do you know? There are sharpening stones which had been set to a military secret in Samurai era. –? Kyoto Natural Sharpening Stone — In Japan, There are sharpening stones which had been set to a military secret by administrators in Samurai era. Because sharpening stones improves their swords performance. That is to say, military strength is advanced. That’s the reason how come Samurai swords are strong and sharp. To professional whet expert’s web site Let me tell you the history of this sharpening stones. 250 million years ago, sedimentary rocks moved to the one place (in what is now Kyoto) by Earth plate. Moreover, tectonic movements had made 20...