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If you buy them second hand they don't always. Boxed Thruingians and Eschers don't always have a space for a slurry stone.

Don't bank on it: yesterday I got this Escher that had been used as an oil stone.

In the past Eschers even had on the label they could be used with oil or water, one of those labels was posted...

Arkansas stones are hard, Thuringians and Eschers are stoft stones like coticules. Only the colour is different. Thuingians and Eschers range from green to grey to blue. Good hunting!