Etched marble needs repair! A shampoo bottle was left in the top, left corner of this marble bath tub leaving a lighter appearance where acid hit. Etching occurs when an acidic product is left on the surface of a stone and slowly reacts with the calcium carbonate, eating away at the marble. This marble bath needed to be diamond honed and polished in order to bring the stone back to life. It is like the etch was never there! This marble bath has luster once again!