Refinish Black Slate Fireplace Surround

I have a black slate fireplace surround and I've drop acetone on the slate which removed a portion of the black finish to show the true gray color. I don't believe the slate is painted, but stained in some way.
Does anyone know of a slate staining product I could apply to my slate surround so it has a nice new black finish?
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Boiled linseed oil, thinned with common mineral spirits, should work very well. Wipe on, wipe off, then dispose of rags as per directions on the linseed oil can.

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I've installed slate in my house. Applying slate sealer tends to darken the slate slightly. I suggest you clean your slate with solvent to bring it all to a uniform colour and seal it with slate sealer. Slate suppliers usually recommend that you do that periodically anyway to keep the slate looking new.
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Can I get a rough ratio for the linsees oil and mineral spirits? Also, do you think I shoudl apply more linseed oil to the "dry spot" created by the acetone to help saturate the slate evenly? Maybe that is just being overly cautious.
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