quality:corruption, structural:expansion, information:classification, quality:correction
Degradation by acids

Acids react with the calcium carbonate in marble, producing carbonic acid (which decomposes quickly to CO and H O) and other soluble salts :

Outdoor marble statues, gravestones, or other marble structures are damaged by acid rain whether by carbonation, sulfation or the formation of "black-crust" (accumulation of calcium sulphate, nitrates and carbon particles). Vinegar and other acidic solutions should be avoided in the cleaning of marble products.