What are the effects of acid rain on the surface finish of granite outdoor planters?

Acid rain significantly impacts the surface finish of granite outdoor planters, leading to visible and structural deterioration over time. The acidic components, primarily sulfuric and nitric acids, react with the minerals in granite—particularly feldspar and quartz—causing chemical erosion. This results in a loss of polish, pitting, and a rough, uneven texture.

Discoloration is another common effect, as acid rain strips away the natural luster of granite, leaving dull or whitish patches. Prolonged exposure weakens the stone’s integrity, making it more prone to cracking or flaking. To mitigate damage, sealing granite planters with a protective coating and regular cleaning can help preserve their appearance. Understanding these effects is crucial for maintaining the longevity and aesthetic appeal of outdoor granite decor.