eli5 – why gold with 24 karat is only 99.9 pure?

Question

eli5 – why gold with 24 karat is only 99.9 pure?

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Answer 1

It’s *at least* 99.9% pure. It can be more pure as well, it’s just the lower limit for 24 karat. And purifying metals to ultra high purity is often both expensive and pointless – almost all uses of gold are ok with 99.9% purity.