So Theo Gray has used dry ice on the Today Show to make ice cream. The ice cream is carbonated, and he tells me it just doesn‰??t taste good, but when you‰??re desperate for ice cream on a Saturday night and all you have is a CO2 fire extinguisher, some heavy cream, and some oreos, it‰??s what you do (and I imagine some beer of some kind).

You can do it, it‰??s just not as good as the liquid nitrogen variety.

The main impurity in liquid nitrogen can be oils from the transfer lines. I‰??m of course assuming you are putting it into clean/new transfer dewars. I find that these are present more in the end than at the beginning of a tank, so when we make ice cream I do try to ensure that we are taking from a fresh tank, not the end of the tank. I know that isn‰??t foolproof, but it‰??s at least one thing you can do.

Dave

> On Sep 23, 2016, at 12:08 PM, Debbie M. Decker wrote:
>
> I wonder - could you do similar with crushed dry ice? Sounds like a weekend project to me ‰?|..
>
> Thanks for the recipe, David. In the absence of LN2, that‰??d freeze up nicely in an ice cream freezer, too.
>
> Debbie M. Decker, CCHO, ACS Fellow
> Immediate Past Chair, Division of Chemical Health and Safety
> University of California, Davis
> (530)754-7964
> (530)304-6728
> dmdecker**At_Symbol_Here**ucdavis.edu
>
> Birkett's hypothesis: "Any chemical reaction
> that proceeds smoothly under normal conditions,
> can proceed violently in the presence of an idiot."
>
>
> From: ACS Division of Chemical Health and Safety [mailto:DCHAS-L**At_Symbol_Here**PRINCETON.EDU] On Behalf Of DAVID Katz
> Sent: Friday, September 23, 2016 7:04 AM
> To: DCHAS-L**At_Symbol_Here**PRINCETON.EDU
> Subject: Re: [DCHAS-L] Liquid Nitrogen Ice Cream
>
> Hi Melissa,
>
> I have made liquid nitrogen ice cream for years with no problems. Here is the link to my procedure http://www.chymist.com/Liquid%20N2%20ice%20cream.pdf
>
> Remember, you are working with a cryogenic fluid. Safety procedures must be followed as well a food safety procedures..
>
> At the ACS meeting in Boston, the RSC hired the Wiches of Boston to make liquid nitrogen ice cream at their booth in the exposition. They used my recipe. http://www.chymist.com/Liquid%20N2%20ice%20cream.pdf
>
> Best regards,
>
> David
> _________________________________________________________________________
>
> David A. Katz
> Chemist, Educator, Expert Demonstrator, Science Communicator, and Consultant
> Programs and workshops for teachers, schools, museums, and the public
> 133 N. Desert Stream Dr. * Tucson, AZ 85745-2277 * USA
> voice/fax: (520) 624-2207 * email: dakatz45**At_Symbol_Here**msn.com
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> _________________________________________________________________________
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