Over 100 medals won during the 2016 Summer Olympics in Rio de Janeiro have been returned to the Brazilian Mint because of rusting and the development of black spots. The latest issue has to do with medals handed out to more than 130 winners - they're rusting, chipping or as Agence France-Presse put it, "falling to pieces".
"We're seeing problems with the covering on between 6% and 7% of the medals", said Andrada.
"Together with the International Olympic Committee we're setting up a system for replacing the defective medals", he said, adding that the problem was prevalent mainly with silver medals and that the makers, the Brazilian mint, were undertaking the task.
Olympic Games organizers insist the issues are "completely normal".
Temperature issues, however, aren't the only reason some athletes are seeing defects in their medals, according to Andrada.
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Andrada confirmed that at least 130 medals, including some from the Paralympics, are being fixed by the Brazilian Mint, who originally supplied them.
It adds: "Only clean it using a soft, dry cloth... do not use any liquids, chemicals or abrasive substances when cleaning it". The gold medals were without mercury, and the silver and bronze were made from 30% recycled materials.
"They make use of recycled raw silver at 92.5 per cent purity, coming from leftover mirrors, waste solders and X-ray plates", the Games' website explains.
A total of 2,488 medals were produced for the Olympics and hundreds more for the Paralympics.
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