Assertion: sea urchin's spine | /r/HasProperty | black
Facets:
value: typically
type: DEGREE
Source sentences:
text: The test and spines of a mature adult are typically black, but lighter colored spines may be intermixed, and in rare cases the urchin will be almost entirely white.
text: The spines are gone when they are no longer protruding from the skin, and there are no black or gray dots remaining at the surface of the skin.
text: The spines on the upperside are black and pointed.