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https://www.leaf.tv/articles/how-to-take-the-impurities-out-of-gold/
Submerge the unrefined gold in a mixture of nitric and hydrochloric acids. This method will dissolve the ore and separate the gold from the impurities, which can later be washed away. The remaining substances will be just water and gold, the latter having a purity level of more than 99.99 percent. Dry this residue until only gold powder remains.
https://link.springer.com/article/10.1007/BF03214762
In 89 percent of the samples, gold bullion met or exceeded hallmarked purities. As expected, the principal impurity was silver followed by iron, copper and lead. At surprisingly low levels, some impurities can impact manufacturing processes, resulting in hard spots, embrittlement, blistering, and discoloration.Cited by: 19
https://link.springer.com/content/pdf/10.1007%2FBF03214762.pdf
In 89 percent of the samples, gold bullion met or exceeded hallmarked purities. As expected, the principal impurity was silver followed by iron, copper and lead. At surprisingly low levels, some impurities can impact manufacturing processes, resulting in hard spots, embrittlement, blistering, and discoloration.Cited by: 19
https://www.jewelrynotes.com/how-to-determine-the-purity-of-gold-jewelry/
To see how much gold your jewelry contains, look at the stamp indicating its karat. Thus, a piece of jewelry that has a purity of one karat consists of 1 part gold and 23 parts other metals or alloys. Purity can also be measured in percentages and parts per thousand.
https://www.gold.org/about-gold/about-gold-jewellery
Thus, the fineness mark is 585 in most 14 carat gold jewellery. Similarly, 24 carat should be 1.0 (24/24 = 1.00). However, in practice, there is likely to be a very slight impurity in any gold, and it can only be refined to a fineness level of 999.9 parts per thousand. This is stated as 999.9.
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