I just put my stems into the next batch of green dragon. I dont think that the acetone thing is dangerous though. Acetone evaporates pretty quickly when left out and as long as you let your stuff sit in the open for a good long time I doubt there would be any. Just make sure you are using pure acetone. I certainly wouldn't get it near any open flames though. Despite the fact that I dont think it is dangerous, I think I will stick with using everclear for extraction.