ISO 11426:2014
Jewellery — Determination of gold in gold jewellery alloys — Cupellation method (fire assay)
ISO 11426:2014 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.
ISO 11426:2014 is intended to be used as the recommended method for the determination of fineness in alloys covered by ISO 9202.
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Foreword
Introduction
1 Scope
2 Normative references
3 Principle
4 Reagents
5 Apparatus
6 Sampling
7 Procedure
7.1 General
7.2 Yellow and red gold alloys, free of nickel, and palladium white gold alloys
7.2.1 Assay sample
7.2.2 Proof assay samples
7.2.3 Cupellation and treatment of precious metal buttons
7.2.4 Parting of the silver/gold samples
7.3 White gold alloys containing nickel
7.3.1 General
7.3.2 Cupellation with additional lead
7.3.3 Scorification
7.4 White gold alloys containing palladium
7.5 Gold alloys incorporating more than 40 % silver
7.6 Alloys containing 999 ‰ gold
8 Calculation and expression of results
8.1 Proof assay sample factor
8.2 Calculation of gold content
8.3 Repeatability
9 Test report
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Principle
4 Reagents
5 Apparatus
6 Sampling
7 Procedure
7.1 General
7.2 Yellow and red gold alloys, free of nickel, and palladium white gold alloys
7.2.1 Assay sample
7.2.2 Proof assay samples
7.2.3 Cupellation and treatment of precious metal buttons
7.2.4 Parting of the silver/gold samples
7.3 White gold alloys containing nickel
7.3.1 General
7.3.2 Cupellation with additional lead
7.3.3 Scorification
7.4 White gold alloys containing palladium
7.5 Gold alloys incorporating more than 40 % silver
7.6 Alloys containing 999 ‰ gold
8 Calculation and expression of results
8.1 Proof assay sample factor
8.2 Calculation of gold content
8.3 Repeatability
9 Test report
Bibliography