Assertion: birch's bark | /r/CapableOf | develop dark gray
Facets:
value: to black markings
type: OTHER
value: to horizontal streaks of gray
type: OTHER
value: as the tree ages
type: TEMPORAL
Source sentences:
text: Depending upon the type of birch, the bark can be white, silver or variations of both, developing dark gray to black markings or horizontal streaks of gray as the tree ages; the bark on older trees is much darker than on young trees.