I was wondering as well. I found it in the alchemists hut and thought this is neat. I was trying to place it in my house when it sort of normalized with the lid sideways and saw pig written under the cap. I was wondering if it was a quest item...possible spoilers
There is a quest in that town nearby to find some man's sister who is an alchemist...might be linked to that? Maybe turned herself into a butterfly who knows hahaha!
"Why are all the good things so Tasty?" ~Homer Simpson