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Dragon's Tonque or Dragon's Tongue is a fairly common whetstone from the North Wales Shale family. Dragon's Tonque slate has been commercially mined since 1860 by Inigo Jones & Co's Tudor Slate Works in Groeslon at Carnarvon in the Aberllefenni quarry and the Aberllefenni mines. Due to a fairly well-established production and marketing process, as well as sufficient reserves of the breed, Dragon's Tonque has become widespread as a whetstone, as well as a stone for finishing razors. Dragon's Tonque has a fairly wide range of possible colors (Red/Blue/Gray, as indicated in the guide) from light gray to dark gray, sometimes with a reddish or greenish tint due to impurities of various metal oxides. Most often, the color of Dragon's Tonque slate is closer to black, especially when wetted.

 Dragon's Tonque is quite dense and hard compared to other natural stones used for sharpening, its density is up to 2.8 grams per cubic centimeter. There are quite different data in the positioning of Dragon's Tonque slates in terms of abrasive ability - from 4000 to 10000 grit in comparison with the grit of synthetic abrasives. This slate sample has been tested and claimed to be 8000 grit. In operation, Dragon's Tonque gives a uniform risk and higher material removal rates than most shale grades used in sharpening.


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