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18 karat yellow alloys will have perhaps 5% Ag the balance been mainly copper and a small amount of zinc that’s why 18 k will dissolve in AR and 14 k is probably around 7% Ag so again it should dissolve in AR.
I believe that the Germans use 8k the UK ,Australia and New Zealand and perhaps others use 9k while the US uses 10k.
As an aside much Italian 9k has no silver so again easy to dissolve in AR.

[QUOTE="nickvc, post: 384869, member: 8804"] 18 karat yellow alloys will have perhaps 5% Ag the balance been mainly copper and a small amount of zinc that’s why 18 k will dissolve in AR and 14 k is probably around 7% Ag so again it should dissolve in AR. I believe that the Germans use 8k the UK ,Australia and New Zealand and perhaps others use 9k while the US uses 10k. As an aside much Italian 9k has no silver so again easy to dissolve in AR. [/QUOTE]

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