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I'm not sure about the Shaptons, but with the Naniwa SS that might be a bit confusing as they, for some reason, changed the colors on the various grits some years back if I remember correctly;)
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As the others have said, a markie is a fine tool for marking the stones.
It is easily removable, and will not do damage to any stone.

On stones that can handle it, I've added Shellac over the...