Assertion: alloy's copper | /r/HasProperty | 4%
Facets:
Source sentences:
text: White gold (18 carat) Gold (75%), palladium (17%), silver (4%), copper (4%) Jewelry.
text: Devarda's alloy (CAS # 8049-11-4), is an alloy of aluminium (44% – 46%), copper (49% – 51%) and zinc (4% – 6%).