Anyone who is active in Precious Metal Market or Jewellery /Precious Metal Manufacturing should control the carat perfectly. The oldest and most assuring method to determine the purity is the Fire Assay Analysis (Cupellation) method. The cupellation method is a certified method and still gives greater precision than any other method.
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The Full Fire Assay Analysis Operation, How to Control Gold Karat / Carat Purity
You can use the table below for refence.