Hello,
I present you some old Belgian colticule hones, those stones are extremely slow with or without slurry, but they give an excellent result.
1) First one : a green/grey color
Attachment 344960
Attachment 344961
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Attachment 344964
2) Second one : khaki color
Attachment 344965
Attachment 344966
Attachment 344967
Attachment 344968
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3) Third one : khaki color with a brown marble
Attachment 344971
Attachment 344972
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Attachment 344976
Best regards.