I am a Chemist, and would like to echo what many have already pointed out: you did not create dry ice. The frozen material is, indeed, water from the air. It is bitter, as you wrote, because of the contaminants from the canned hyrdocarbons, and other contaminants in the air and water vapor. In the future, I would STRONGLY recommend not tasting experiments before fully understanding them. You could easily poison yourself as many alchemists and poor scientists did in the past. NOT dry ice.

Great instructable! I will try that!

I don't think this is CO2. For one, I don't think those cans of air use CO2... secondly, that appears to be H2O ice formed from condensation in the air, possibly with the gas from the can inside.

"metal cylinder not aluminium"? last time i checked aluminium was a metal, what kind of extinguisher am i looking for here?

what you got isnot dry ice, it is only ICE. it is come from the steam on the air

OR for a third of the price you can buy 50 times as much dry ice from a store.

and how would you know it is bitter??

tip it upside down and squirt stuff with the air duster its so cool (litteraly) wots in this stuff liquid nitrogen or sumthing

most of the dusters use some type of compressed refrigerent ie dicloroethane if I spelled it correctly if you do breath the gas in there is a good chance you will die of sufercate and like mention before most are flammable and can decompose into deadly gases try spraying R12 or R22 into a flame and see how quickly it can kill you I use these duster cans to cool electronic components while soldering / desoldering components if you let a few drops on a q-tip it will say cold for for longer time then without also good on any warts you have as well as cheaper then the 30 dollar kit the sell but I do agree if you need to cool something large buy dry ice instead of wasting a whole can of duster.

so is this really dry ice? also so all i do is spray the air duster in a can and push down on itr with the beer bottle

Not to rain on the parade...but <wikipedia>

A gas duster, also erroneously referred to as canned air, is a product consisting of liquefied difluoroethane, trifluoroethane, or tetrafluoroethane in a spray can, with a long ..... Gas dusters do not use compressed air, but other inert gases that are much easier to compress into a liquid state. Hydrocarbons, like butane, were often used in the past, but their flammability forced manufacturers to use fluorocarbons.

This stuff is definitely not CO2, and although intert, I wouldnt argue that they're safe; Dust-off's official website has links to 'prevention of inhalation addiction' sites.

Neat project, but I'd have to say *as others have already* not safe, and overly wasteful.

I heard somewhere that you should empty the duster in short bursts instead of one long continuous stream to prevent the Co2 from clogging and making you think its empty.

Cool, but it is more practical to just spray whatever you want frozen with the bottle, and have a friend buy you some dry ice for alot cheaper at the grocery store. I'll give you a 3.5* for having a cool idea though!

ya not very prctical lol. costs like 5 bucks for those airdusters. go to safeway or luckys, they sell it for around a dollar a pound :)

great idea! although, most food stores have dry ice for sale

cool !