Contrary to common-belief, you may still get stains even when your stone is sealed. However, most of the blemishes you find from everyday use are actually “etches” and not “stains.” Etches are generally caused from caustic products and acids, such as: citric acid, alcohol, hairspray, vinegar, and bleach. They usually appear as colorless dull spots. Stains are discolorations inside the stone that are caused by oils and dark liquids, like wine and ink. In many cases these stains can be extracted – but sometimes they can not.