What a brilliant comparison - thank you. Very very useful.Well the slurry is exactly like a Charnley Forest stone and not like my Fiddish River stone. The slurry from my Fiddish River stone is like a greenish clay. CF is just white.
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I don't have slurry pics for the CF in question, but usual white. These are very different stones some Fiddish do look a lot like a CF or a Llyn Idwall, but in hand there is no mistaking them for each other. There is also a Glanrafon Charley Forest stone which is very similar to the Fiddish, but it is not like a Charnley Forest and it is from Wales. These are soft sort of marble and hard slate stones. Where a Charnley Forest is novaculite more like a Arkansas.