pro's use oxalic acid to get the final hi gloss. Oxalic acid reacts with the
calcium carbonate in the marble to produce calcium oxalate on the surface.
It smoothes the marble finer than any abrasive could.
Don't ask me where to get it though
Order it from a proper chemist. You may have to sign some forms or other
but if you've got a good reason, anyone can get it.
Only problem we had, was it came in a rather large vat rather than a small
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