In the first half of 20th century, how was gold inspected for authenticity? – history.stackexchange.com

In the first half of 20th century, how was gold inspected for authenticity? – history.stackexchange.com

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Let's say this for the years 1900 - 1950, before we had modern analysis tools. When trade payments were made in gold, how was the gold inspected for quality? How did they assess the purity of gold, ...

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