M00018974
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ISO DIS 11426 2013 Edition, July 15, 2013 DETERMINATION OF GOLD IN GOLD JEWELLERY ALLOYS - CUPELLATION METHOD (FIRE ASSAY)
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Availability date: 07/14/2021
Description / Abstract:
This International Standard specifies a cupellation method (fire
assay) for the determination of gold in gold jewellery alloys.
The gold content of the alloys should preferably lie between 333
and 999 parts per thousand (‰). The procedure is applicable
specifically to gold alloys incorporating silver, copper and zinc.
Some modifications are indicated where nickel and/or palladium are
present in the so-called white gold alloys, as well as for alloys
containing 990 or more parts per thousand (‰) of gold.
This method is intended to be used as the referee method for the
determination of fineness in alloys covered by ISO 9202.