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Yes, yellow on yellow, blue on blue.

Grits: if the stone has chips or cupping, start with something coarse, say 400 or so, until you get it flat. If it's pretty close to flat to begin with, I'd...

Most slurry stones are natural; if it's not a combo, then you can use any side. Good idea to lap the surface you intend to use; if it's rough you scratch your main stone up unnecessarily.

If it's...