![]() ![]() ![]() Nearby factories or industrial activities can generate pollutants that can change the appearance of the stone or chemically interact with the stone over time. Air pollution, including particles from vehicle exhaust, can deposit on the surface of marble. ![]() Dirt can retain moisture after rainfall and lead to the growth of mold or mildew on the stone surface. If the headstone has sunk into the ground over time, then is raised and realigned, a distinct line of soiling can be seen. Minerals containing iron can leach into the marble surface and leave rust colored stains behind. Dirt can penetrate into the pores of the stone and be difficult to remove. Dirt can lead to dark staining on the surface or an overall dingy appearance.
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