Assertion: solder's lead | /r/HasProperty | its primary ingredient
Facets:
value: traditionally
type: OTHER
Source sentences:
text: Soft solder is so called because of the soft lead that is its primary ingredient.
text: Lead has traditionally been a primary component of solder, but because it constitutes a health hazard, it has largely been eliminated from solder used by plumbers, electronics technicians and home hobbyists.