Assertion: wine's tannin | /r/CapableOf | act as preservative
Facets:
Source sentences:
text: Pigmented tannins, anthocyanins, colloids, tannin-polysaccharides and tannin-proteins not only influence a wine's resulting color but also act as preservatives.
text: Since acids and tannins slow the oxidation process and act as preservatives, wines that have high levels are better candidates for a longer aging process.