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Brass gets discolored in the air due to the presence of hydrogen sulphide. It is due to the presence of the mixture of hydrogen and sulphide that makes Brass discolored.
Brass gets discoloured in air mainly because of oxygen and moisture, which react with the copper content in brass and form copper oxide. In polluted environments, sulphur compounds (like hydrogen sulphide) accelerate tarnishing, causing the surface to darken faster. This is a natural reaction but can be slowed with regular cleaning. For high-quality brass items that retain shine longer and come with proper care guidance, http://www.brassglobe.com offers some of the best handcrafted brass products.