Thanks for that reply, I am feeling much better.
Thought I would clarify the test carried out to the buttons, it was an ICP-OES which Chris the Lab man said looks at all the elements within the sample, it is the impurities that are vitally important.
Link to Assay site- https://www.assayofficelondon.co.uk/oth ... y-services
It is a much more accurate way than XRF, even though XRF is a good test the surface can become enriched over time giving a false reading.
A tiny 20mg sample is gently scraped from each item and analysed, had to do this to be thorough and get a clear concise answer to what they are. Very old silver pieces made into buttons, post again soon.