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[Heedicalking]

I have a poison vat as well as a venom barrel, but when attempting to coat items at the poison vat, the "Extract-containing item" is red. I traded for the barrel, did I need to milk a creature myself for it instead?

[Dave Nicksen]

I guess it was said somewhere that you need to have the barrel inside the workshop to complete the reaction.
I would try using the DFHack command "autodump" and then reclaim the barrel.

[UnlawfullyDeranged]

Super necro, but this is the only thread I could find on the topic, and I just wanted to post my fix in case anyone else came looking. My problem was similar in that I had a bunch of milked asp venom, but the poison vat would only use the one barrel of honey bee venom I had from a caravan. If I forbid the honey bee venom, "Extract-containing item" came up in red. Turns out that's what happens when you don't have a valid venom extract I guess. Found out that the poison vat requires the extract to have the [REACTION_CLASS:ADD_SPATTER_VENOM] tag rather than the [REACTION_CLASS:IS_VENOM] tag. Honey bee venom had the former, asp venom had the latter, likely due to the asp being added as part of a separate mod. Replaced IS_VENOM with ADD_SPATTER_VENOM and it's been working ever since.