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Acid Washed
Liquid acidic rinsing to the surface of the stone. This will slightly to moderately etch the stone according to the acid percentages in the rinse, typically a mixture of muriatic acid and water, and the type of stone. This is done to take the shine of polished stones down to a honed finish.
It also can sometimes make the stone more slip resistant. Acid washing tends to enhance the stone’s color and character. Can be used for interior and exterior use, depending on the stone and the type of acid washing.