acetone doesnt float on water, acetone mixes with water.... If you do a paste with sodium carbonate and mimosa with a bit of water, let that completely dry and then pull with acetone, you'll get some goo which can be further cleaned up if you have fumaric acid (redissolve in acetone, FASA, filter, rebase as a paste, re pull, etc.. repeat this a couple of times and it gets purer).. I did a test extraction like this recently and Ive had some limited success, the product didnt get very pure but probably smokable... Its pretty wasteful in terms of acetone though I think...