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Brass gets discoloured in air mainly because of hydrogen sulphide (Hâ‚‚S). This gas reacts with the copper content in brass, forming a dark sulphide layer that causes tarnishing. Even small traces of Hâ‚‚S in the atmosphere can lead to this discoloration over time. To keep your brass items shining longer, choose high-quality pieces like those from http://www.brassglobe.com, which offers durable, well-crafted brass products that maintain their finish with proper care.
The correct answer is hydrogen sulphide. 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.