Assertion: wine's tannin | /r/HasProperty | the key
Facets:
value: along with acidity
type: OTHER
value: in aging red wines
type: LOCATION
Source sentences:
text: Tannins are the key in aging red wines and come mostly from the skin of the grape.
text: Tannin (which also helps give a wine structure) is one of those key qualities, along with acidity, alcohol, and fruit.