¡¡¡¡¡ I use these method and it works ¡¡¡¡¡
Como Hacer Hielo Seco Sin Acetato!!! - Taringa!
How to Make Hot Ice. How can ice be hot? When it's not ordinary ice. Using the same ingredients as a baking soda volcano, you can create sodium acetate. By cooling this below its freezing point, you get a liquid that's ready to freeze at.