Assertion: hoard's gold | /r/HasProperty | alloyed with up to 25% silver
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Source sentences:
text: It must have been spoken about by the brilliant Anglo-Saxon metal workers, and involved taking gold which was alloyed with up to 25% silver, and heating it in an acid solution – made from iron rich minerals such as brick dust – so that at the surface the silver leached out and could be burnished off.