Assertion: soldering iron's tip | /r/HasProperty | copper
Facets:
value: mostly
type: DEGREE
value: with a protective iron plating
type: OTHER
value: historically
type: TEMPORAL
Source sentences:
text: Historically, stained glass soldering tips were copper, heated by being placed in a charcoal-burning brazier.
text: The tips are mostly copper with a protective iron plating, and once that plating is pierced, the tip will die quickly.