DRY ICE !
Dry ice is frozen carbon dioxide, and is very, very, very, very, cold (-109 F). It's nothing to be afraid of, but there are some simple safety concerns; for example:
* Always use dry ice with adult supervision. DO NOT allow kids to handle or mess with dry ice.
* ALWAYS wear gloves or tongs when handling dry ice. It is so cold it will cause serious burns to bare skin.
* ........ will keep food frozen for 12 hours, ........ pounds for 24 hours, etc.
* Do not place dry ice directly in food. Keep food wrapped in freezer paper.
* Do not eat dry ice.
* Use dry ice in a well ventilated area, like outdoors. The carbon dioxide that is released as a gas can be dangerous in enclosed spaces.
* Do not place bottled or canned sodas in dry ice. They will explode.
* Do not keep dry ice in an airtight container. Ice chests are fine.
* Do not keep dry ice in your regular freezer, it will shut off the thermostat.
* Dry ice is generally available in blocks or small nuggets and costs around $1 per pound.
* Do not chop up the block yourself, if you want small chunks, buy those.