I want an old-style poison, and I have an old-style antidote that I'd like to trade for it. Or, if you do not want to trade, or want a trade+ , tell me what you want.
Just so anybody interested in the trade knows fully what they are doing:
I believe old-style antidotes can still be gotten randomly from interacting with trees. Or at least, they could be gotten for a while after potions were introduced.