What chemical mixes will result freezing

Jul 2014

I am not chemist, or have any knowledge about chemical reactions. For my project i am trying to achieve freezing point by mixing two chemicals in their liquid forms. Just like "Ice Packs" but ice packs are not cold enough for my project. I need something that will get much colder. Any Ideas?
I thank you in advance for your time and effort!!!
Sep 2014
colder than ice packs!! need some time to think for it.
By the By, Using genuine Chemical i.e. chemical should have required certification. Know if the chemical you are using falls under REACH certification.