Assertion: amorphous selenium | /r/HasProperty | black
Facets:
value: usually
type: TEMPORAL
value: in vitreous form
type: OTHER
Source sentences:
text: Amorphous selenium is red in powder form and is black in vitreous form.
text: glassy amorphous selenium (usually called 'black') can actually look grey, but should not be confused with metallic (grey) selenium.
text: Amorphous selenium is either red (powder form) or black (vitreous form).