20130303

Sub-Zero Anti-Griddle Party

We had a nice turn out for my pre-birthday sub-zero party. We made the ghetto version of a anti-griddle using a $5 block of dry ice and a metal tray. The tray quickly drops to a very cold temperature near -80C after being placed on the dry ice. There is a initial nails on chalkboard audible racket. I'm not sure if it's the metal contracting or just the sounds of dry ice scratching the metal. We flash froze different ingredients into popsicles. We found a few recipes that worked pretty well. These are the favorites. I'm looking forward to trying this again on a hot summer day.

honey + lime chipotle
blood orange + cream + honey
balsalmic vinegar + vanilla + cream chocolate ganache
kashi cereal adds a nice puffed crunchy texture
pretzels sticks can be used in place of popsicle sticks for handles

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2 comments:

Killbox said...

The sound is caused by the sublimating gas pushing the metal away because the tray is a good heat sync, it causes very rapid melting of the dry ice, causing a co2 gas layer to form, you can make dry ice scream by placing the back of a spoon on it too..

Joel said...

There's an old chemists' trick to get better contact and slightly lower temperatures, which will also cut the noise down a little. The big drawback is you'll need to vent the exhaust yet-more-carefully:

Add acetone (nail polish remover) to the dry ice. This is similar to adding salt to ice: the tendency to dissolve bumps up te entropy of the resulting fluid, tipping the Gibbs-free-energy balance in favor of a lower-temperature phase transformation.