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DIN EN ISO 11426:2021
Jewellery and precious metals - Determination of gold - Cupellation method (fire assay) (ISO 11426:2021); German version EN ISO 11426:2021
The document specifies a cupellation method (fire assay) for the determination of gold in gold jewellery alloys. Preferably the gold content of the alloys lies between 333 and 999 parts per thousand gold. The procedure applies specifically to gold alloys incorporating silver, copper and zinc. Some modifications are indicated where nickel and/or palladium are present in the socalled white gold alloys, as well for alloys containing 990 or more parts per thousand of gold.
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Deutsches Institut für Normung [din]
Deutsches Institut für Normung [din]