What are the effects of acid rain on marble outdoor bar stools over decades?

Acid rain has a profound and lasting impact on marble outdoor bar stools, gradually deteriorating their appearance and structural integrity over decades. Composed primarily of calcium carbonate, marble reacts chemically with the sulfuric and nitric acids in acid rain, leading to a process called dissolution. This reaction causes the surface to become pitted, rough, and discolored, losing its original luster.

Over time, the continuous exposure weakens the marble, making it more prone to cracking and chipping. The intricate carvings and smooth finishes typical of bar stools may blur or vanish entirely. Additionally, acid rain accelerates the leaching of minerals, further compromising durability.

Preventive measures like sealing the marble with protective coatings or relocating stools to sheltered areas can mitigate damage. However, in heavily polluted regions, even these steps may only delay the inevitable erosion. Understanding these effects helps in making informed decisions about material choices and maintenance for outdoor furniture.