Assertion: coin's metal | /r/HasProperty | copper
Facets:
value: usually
type: DEGREE
Source sentences:
text: Tokens" are often made of cheaper metals: copper, pewter, aluminium, brass and tin were commonly used, while bakelite, leather, porcelain, and other less durable materials are also known.[citation needed]
text: The best metals for coinage are gold, silver, platinum, copper, tin, nickel, aluminum, zinc, iron, and their alloys; certain alloys of gold, silver, copper and nickel have the best combination of the required qualities.[citation needed]
text: Low-grade alloy of gold or silver with a high percentage of another metal, usually copper.