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Naniwa are water stones, use them with water only

You are not going to find a fake Escher/Thuringian simply because the appearance can't be fabricated. Rocks of particular types look in a particular way and nothing can change that. if in doubt you...

For the price they are asking for a 5 3/4" stone you can get a 8" or even a 10" Escher on eBay. You will pay less for a big size Thuringian. Those Timber Tools "Escher" stones used to be $60 a few...