Assertion: ore's silver | /r/HasProperty | alloyed with copper
Facets:
Source sentences:
text: Because pure silver is very soft, most silver used for these purposes is alloyed with copper, with finenesses of 925/1000, 835/1000, and 800/1000 being common.
text: By the way, the tracks are made of brass or nickel silver, another alloy of copper.