Assertion: ore's silver | /r/HasProperty | purified to over 99.9% purity
Facets:
value: via electrolysis in nitrate solution
type: MANNER
Source sentences:
text: This is then separated and purified of base metals by treatment with hot aerated dilute sulfuric acid and heating with lime or silica flux, before the silver is purified to over 99.9% purity via electrolysis in nitrate solution.