There are a few scientific methods for precisely determining karat gold purity, some destructive (fire assay) and others nondestructive (X-ray florescence). Both methods require costly equipment, special procedures and a well-lit and ventilated area. A simpler method for determining gold purity in jewelry is the touchstone testing process, an age-old technique that is relatively nondestructive to jewelry and offers quick results.... (2011) Complete Story
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