Assertion: lead pencil's lead | /r/HasProperty | useful
Facets:
value: by today's painters
type: OTHER
value: for smooth even shading
type: PURPOSE
value: because of its toxicity
type: CAUSE
value: especially
type: DEGREE
Source sentences:
text: The wider leads are especially useful for smooth even shading.
text: White lead is less used by today's painters, not because of its toxicity directly; but simply because its toxicity in other contexts has led to trade restrictions that make white lead difficult for artists to obtain in sufficient quantities.