The skin of a shark was once used commercially as sandpaper. True or false?
True or False-Face True or False-Face "True or False-Face" is the 17th episode of the "Batman" television series, first airing on ABC March 9, 1966 in its first season. It guest starred Malachi Throne as False-Face. The master of disguise, False-Face, manages to steal the jeweled Mergenberg Crown and replace it with a false one right under the watchful eyes of the police. Included with the false crown is planning to rob an armored car. Batman catches False-Face, who is disguised as one of the armored car drivers but manages to escape in his Trick-Truck. Batman and Robin follow False-Face into an alley,
Sandpaper natural gum. 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. Glass paper was manufactured in London in 1833 by John Oakey, whose company had developed new adhesive techniques and processes, enabling mass production. Glass frit has sharp-edged particles and cuts well whereas sand grains are smoothed down and do not work well as an abrasive. Cheap sandpaper was