Originally Posted by CHansen6
Dry ice and water still wont get any colder than normal ice and water. Water is still limited to 0 celcius as it's freezing point, more or less. If you want to flash freeze the neck of the bottles use acetone and dry ice, -78 Celcius. You of course then are potentially introducing poisons into your drink.
There was something about ice and Calcium chloride I read about reaching -30 or -40 celcius when used as a slurry with just ice, no water involved.
Calcium Chloride, Magnesium Chloride, even Sodium Chloride mixed with ice can produce a liquid/ice slurry that will be anywhere from -20 to -40C. You could put dry ice in there to maintain the lower temperature over a more extended period of time, but that isn't usually necessary. This water ice/salt mix is traditionally what is done to produce the freezing baths for M.C. (or M.T.). If you tried the acetone/dry ice mixture I'd bet you'd find more bottles breaking from thermal stress than you'd successfully freeze for degorgement.