Bronze sculptures are renowned for their durability and timeless beauty, but over time, they often develop discoloration. This natural aging process is primarily caused by oxidation, where bronze reacts with oxygen to form a patina—a thin layer that can range from green to brown or even black. Environmental factors like humidity, pollution, and saltwater exposure accelerate this reaction, leading to faster discoloration. Additionally, chemical reactions with sulfur compounds in the air can produce a greenish-blue patina, commonly seen on historic statues. Improper cleaning or handling with acidic substances can also strip or alter the patina unevenly. While some discoloration enhances the sculpture's character, understanding these causes helps in preserving bronze artworks for future generations.