The tiles are ink-jet and cold-glazed porcelain, and are meant to weather slightly over time, like wood.  Photo 1 of 10 in A Guide to Ceramic Versus Porcelain Tile from Geometric Tile That Comes in 64 Hues Will Satisfy Your Decorating Dreams

A Guide to Ceramic Versus Porcelain Tile

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These tiles are ink-jet and cold-glazed porcelain, and are meant to weather slightly over time, like wood.