Interesting article, as linked by WineTerroirist, by MichaelaMorris, about the problem of quercetin precipitating
out in wine from 100% Sangiovese:
https://www.meininger.de/en/wine-business-international/sangiovese-throws-strange-quercetin-deposit.
Don't think I've ever observed it (though I don't drink much Sangio) and surprised it can be seen in a deeply-
colored wine like Sangio. Anybody noted these "worms" in your Sangio??
Interesting that Antinori found it in their Sangio from Antica/AtlasPeak and solved the issue by a co-ferment
with "international" varieties (probably the highest calling I can think of for Merlot!!).
Anyway....interesting article for only the geekist of wine geeks.
Tom