Finally got around to trying winterizing and wanted to share. Living in Canada and not having access to Everclear 190 I thought my only option was IPA. Recently I learned Canadian Tire caries BioFlame ethanol http://www.recochem.com/en/products..._living/item/bio_flamesuptm_sup_ethanol_fuel/ you can find the MSDS here http://220.127.116.11/_profiles/_msds/14-414.pdf it's 95% ethanol 5% isoproply alcohol and nothing else, making it suitable for winterizing. However you do lose terpenes with an ethanol/iso purge because of the higher (relative to butane) boiling point. I wanted to dewax/winterize but preserve as much flavor as possible, so a single solvent winterization seemed perfect. Only problem is you need to keep your butane in a liquid state at atmospheric pressure, temperatures of -18c/0f are recommended. People in warmer climates buy dry ice for this, but I live in Canada and it's cold enough to keep butane liquid outdoors, so I did just that. I kept the butane in the freezer and used dried buds that once packed in the glass extractor were put in the freezer with the 50ml beaker. It seems when you winterize you want 10ml for every 1g of oil and since my 7g glass extractor usually puts out 1.5g of oil I figure as the final volume in my beaker around 15ml would be good. Covered it and left it out for a day. Here is the result after pouring out the liquid butane without using any type of filter because the wax is so cold its frozen to the bottom and isnt going anywhere. After this I did my usual cold boil vac purge 115f @ -29.5hg to preserve the maximum terpenes. Final result pictured here. The oil on the dabber is reclaim from regular oil, and on the end of the dabber is small piece of non winterized oil on the parchment is the single solvent winterized cold boil purged oil. amount used: 7g (indica, which usually makes a darker oil than sativa) weight of beaker with the wax: 30g weight of beaker after cleaning: 29.35g amount dewaxed: 0.65g weight of dewaxed oil: 0.7g Usually I yield 20% so 1.4g, I guess this test shows that half of that weight is useless filler junk like epicuticular plant waxes. Is it worth the 50% loss in yield? well, it tastes amazing. I suspect it's in part because when I take a dab it vaporizes instantly giving a rush of flavor, rather than a usual dab that is 50% wax that vaporizes slightly slower and definitely tastes less pronounced. It should certainly be easier to make eliquid mixes in this state as well, slightly warming the oil and mixing it with some propylene glycol, some users are having no issues with mixtures as high as 60% oil for their e-cigs, using just pg. That was fun, what if I wanna do it again? well it looks like I have to either -wait until it gets cold enough -do a 2 step process, butane extraction / ethanol winterization (at the expense of terpenes) -buy some dry ice (I prefer to reduce the amount of consumables required) -purchase an industrial freezer capable of temperatures anywhere from -20c to -85c from http://www.krackeler.com/products/1969-Refrigerators-Freezers-Equipment/15623-ScienTemp-Freezers.htm (seems a bit much for the -85c model that I want) or if that one isn't explosion proof than this one http://ontarioovens.com/85_17industrialfreezers.aspx With this sweet freezer I could also keep my butane at -70c and according to gray wolf this is the temp he extracts at and it doesn't even require winterizing because it barely pulls any waxes at those temps, or I could purchase dry ice and prevent it from sublimating thanks to the -85c temps. Never thought I would be considering industrial freezers in my quest for perfect extracts but here I am. That's all, have a great day!