acetone is not used anymore, its THF? now. It's a better solvent for many things. Also makes a super great super glue remover (the super glue remover tin squirter in the store is THF and it actually works amazing).. it is also low toxicity and the odor is less noxious then acetone.. but the odor in your acetylene comes from arsenic and phosphine related compounds in trace quantity.
I believe its more stable with THF then acetone also, chemically.. you really wanna do your modern research before fooling around with anything involving acetylene transfers... very dangerous. In fact I recommend not doing it at all, for acetylene I won't use any second hand equipment and I have the welding store do the hoses etc.. its the one gas not worth fucking around with yourself IMO. You can do alot of cool things that are safe with other gases like lens/diffuser backfilling apparatus, plasma, etc.. but none of those gases detonate. Even if you buy all the feed plumbing primo its cheap for a shop.
or maybe it was DMF.. I could be off on the THF. But I think when I was asking about the tanks he said the new ones do not use acetone for some reason... but I asked 5 years ago (for airgas).. the clerk happened to have a welding engineering degree so I talked to him a little bit about the specifics and he I recall him correcting me on the acetone remark when I was asking about how they do tank maintenance and stuff (I happened to have possession of a old out of hyrotest spec bottle that was real nasty looking (I cleaned it up, but I was worried about rust along the bottom that seemed to be penetrating a 'seam').. thankfully he took that in as a trade in for a new cylinder since I wire brushed it good.. it belonged to a plumber that I got it from when he retired ).