This article explains how to use the touchstone method for testing purity in karat gold.
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How to know the 24k gold and 22k gold differences - Quora
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How to know the 24k gold and 22k gold differences - Quora
How to know the 24k gold and 22k gold differences - Quora
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How to know the 24k gold and 22k gold differences - Quora
How did ancient people test the purity of gold? They used a touchstone - News - Qingdao Decent Group