These rings and spots are usually not stains and cannot be removed with stain-removing chemicals and poultices. The mineral deposits are the same type that appear in an automatic dishwasher or a glass shower door. If the liquid contains calcium or other minerals, it will leave a spot on the surface in the shape of the bottom of the glass. These are sometimes referred to as hard water spots. Water spots can also be caused by chemicals in the liquid that deposit minerals on the stone. Water spots are caused by slightly acidic liquids running down the sides of the glass and etching the marble. These are the rings left behind from a glass that can appear on marble or other natural stone tables and countertops. Water SpotsĪnother common problem associated with staining is the deposits of water spots and water rings. Moisture can appear uniformly throughout the entire surface, or it can be blotchy. This drying process can take a long time, depending on the temperature, humidity and air flow. The water migrates to the surface to escape and evaporates. This is especially true when stone floors are newly installed. Stone floors can also show moisture spots. Be sure to have the stone properly sealed. When a stone absorbs moisture, this indicates that the stone needs to be sealed. Caution: Do not apply too much heat, especially to granite, because it may cause the crystals in the stone to expand and spall, or the stone to crack. If you suspect the problem is wet stone, give it time to completely dry or take a hair dryer to the suspected wet area and see if the area lightens. The material looks darker until it dries.) (Think about what happens to a pair of jeans when they get wet. When this happens, the stone will appear darker. This occurs when a porous stone is not adequately sealed. Moisture / Wet Stone on CountertopsĪnother common problem mistaken as staining is moisture that has absorbed into the stone. If the etching is severe, it will need to be professionally honed and re-polished. If the etching is minor and limited to a small area, you can use a quality marble polishing compound. To remove an etch from polished marble, re-polishing will be required. This dulling effect caused by acids coming in contact with the calcium in the stone is a condition known as etching. This can also occur on highly polished concrete and some tile surfaces. Acids can be found in orange juice, lemons, soft drinks, foods, household and commercial cleaners, bathroom cleaners, and the list goes on and on. Acid EtchingĪlmost all polished marble will become discolored and dull when it comes in contact with acids. Here are some examples of common stone problems that look like stains but are not actually stains and what can be done to resolve the issues. Sometimes when we get calls from customers regarding a stain on their stone, it is not uncommon to find that the stain is not a stain at all.
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