Assertion: boric acid | /r/AtLocation | borax
Facets:
Source sentences:
text: Boric acid is added to borax for use as welding flux by blacksmiths.
text: Boric acid is added to borax for use as welding flux by blacksmiths.
text: Boric acid is added to borax for use as welding flux by blacksmiths.
text: Boric acid is added to borax for use as welding flux by blacksmiths and farriers.
text: Boric acid is added to borax for use as welding flux by blacksmiths.