Why is marble prone to developing a patina in outdoor environments?
Marble is prone to developing a patina in outdoor environments due to several natural processes. Exposure to moisture, air pollutants, and UV radiation accelerates chemical reactions on its surface. Calcium carbonate, the primary component of marble, reacts with acidic rainwater, forming a weathered layer. Oxidation and biological growth, such as algae or lichen, further contribute to discoloration and texture changes. Over time, these factors create a distinctive patina, altering the stone's appearance while adding character. Proper sealing and maintenance can slow this process, but the patina remains a natural consequence of marble's interaction with the elements.
