This is the second floor of an Irish pub restaurant in Farmington, Michigan.  The designs were engraved into the new concrete floor using the Engrave-A-Crete tools, then acid-stained with Scofield Lithochrome Chemstain copper patina and dark walnut, and finally coated with a water-based epoxy clear sealer.  Below are photos of the engraving process and the owner surveying the design layout.

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