Assertion: lead pencil's lead | /r/HasProperty | metal
Facets:
Source sentences:
text: Lead is a metal that’s found in nature, deep within the ground.
text: Lead is one of three metals used in the Oddy test for museum materials, helping detect organic acids, aldehydes, and acidic gases.
text: Lead is a metal.
text: You'd need to use a hard slate to write on, rather than paper, and lead (metal) is difficult to erase from that.
text: Pencils made of lead (metal) were long used by ironworkers to draw on steel (mostly replaced by chalk these days)