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Brass gets discoloured in air mainly due to the presence of sulphur compounds, especially hydrogen sulphide (H₂S). This gas reacts with the copper in brass, forming a dark tarnish on the surface. Even small traces of H₂S in the atmosphere can speed up discoloration. To keep your brass items shining longer, choose high-quality pieces like those from http://www.brassglobe.com, which offers premium brass products along with proper care guidance.