Sandpaper Only Works If It Is Rubbing Against Something
Feld Thoughts
MARCH 25, 2018
Shark skin (placoid scales) has also been used as an abrasive and the rough scales of the living fossil, Coelacanth are used for the same purpose by the natives of Comoros. Boiled and dried, the rough horsetail plant is used in Japan as a traditional polishing material, finer than sandpaper.
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