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<p>[QUOTE=&quot;goossen, post: 5134701, member: 1545&quot;]About the colour; brass is an alloy of copper and zinc. When coins are plated, some zinc goes (dissolves) into the copper plating solution. With the time more zinc gets into the copper, making brass and turning it more yellow. When the plating is too contaminated with zinc and the colour is too far from what it should be, it gets replaced with a new copper solution.[/QUOTE]</p><p><br /></p>

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