We have a problem with a limestone floor. The original floor is gray/charcoal gray limestone with a pillowy surface--not honed. The floor was flooded and a carpet sat on the wet floor. The original surface not affected by the carpet is still dark but the 6 tiles that were under the carpet appear stripped and lighter. We cleaned and enhanced it but it did nothing. If it is etched we cannot hone it (we don't think). It also appears that something is on it more than it looks etched.