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Actually, they are white. the darker parts of the stones is really light blue. If someone submerge them in oil, then they become black and stay this way forever. Supposedly, the darker the color, the...

It is a Turkish oilstone, I also bought another one a few hours ago :p. One of the fastest stones I know, works as a finisher, but not the finest finishers. Use it only with oil. If it's too coarse,...