The first recorded instance of sandpaper was in 13th-century China when crushed shells, seeds, and sand were bonded to parchment using natural gum. Shark skin was also used as a sandpaper. The rough scales of the living fossil Coelacanth are used by the natives of Comoros as sandpaper.[2] Boiled and dried, the rough horsetail is used in Japan as a...
07:44 Mon 15th Sep 2014