It is because oxygen does not have a strong chemical reaction against 24k silver, gold, platinum.
Explanation
A 24-karat precious metal means that the element is pure, meaning, the contents of the platinum, silver, or gold are at 100%. Pure or 24k silver, gold, or platinum does not easily combine with oxygen, which is a very active element that causes elements like iron to rust. So, instead of rust, only a thin layer of the 24-karat metal develops a patina reaction.
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