Why is marble avoided in sculptures exposed to bird droppings?
Marble, a prized material for sculptures, is often avoided in outdoor installations exposed to bird droppings due to its vulnerability to damage. Bird droppings contain uric acid, which reacts with the calcium carbonate in marble, causing erosion, discoloration, and surface pitting over time. Unlike more durable materials like bronze or granite, marble's porous nature absorbs these acidic compounds, accelerating deterioration. This makes it unsuitable for long-term outdoor display in areas with high bird activity. Preservation experts recommend protective coatings or alternative materials to maintain the artwork's integrity, as restoring eroded marble is costly and often ineffective. For lasting outdoor sculptures, artists and conservators prioritize materials resistant to environmental hazards like bird waste.
