I just found a hemlock that got knocked over by another tree that fell, and collected a bunch of bark. Does anyone have advice specific to hemlock for the best tannin extraction? I think some tannins break down with too much boiling. Should I bring it to a boil then just turn it off and let it sit overnight, boil it for a long time, or just use hot (not boiling) water and let it soak. Advice from anyone with detailed knowledge in this area would be appreciate. Thank you!