According to Forbes.com, the bronze medal for the Paris Olympics is made of 415.15 grams of copper, 21.85 grams of zinc and 18 grams of iron.

What causes Bronze medals to corrode? Bronze medals tarnish mainly due to oxidation, where the metal reacts with oxygen in the air. The medals become primarily dingy due to oxidation.

The metal detectorist from Sundeved spotted the tarnished bronze item and, recognizing its significance, gave it to officials, Museum Sønderjylland said in an April 24 Facebook post.

The metal detectorist from Sundeved spotted the tarnished bronze item and, recognizing its significance, gave it to officials, Museum Sønderjylland said in an April 24 Facebook post.

The metal detectorist from Sundeved spotted the tarnished bronze item and, recognizing its significance, gave it to officials, Museum Sønderjylland said in an April 24 Facebook post.

The metal detectorist from Sundeved spotted the tarnished bronze item and, recognizing its significance, gave it to officials, Museum Sønderjylland said in an April 24 Facebook post.