Assertion: birch's bark | /r/HasProperty | black
Facets:
Source sentences:
text: Bark of the birch can be white, grey, yellow, silver or black in color.
text: Bark of the birch can be white, grey, yellow, silver or black in color.
text: Paper birch is known for its snow white, exfoliating bark, while water birch has mahogany or black bark.