Hot ice, scientifically known as sodium acetate, is a liquid that will turn solid at the slightest provocation. Touching it with your finger, bumping it too hard, or speaking a few angry words will cause it to spring from a clear, water-like state into solid ice-like crystals.
Must try -- Indoor Tulips . . . Step 1 - Fill a glass container about 1/3 of the way with glass marbles or decorative rocks. Clear glass will enable you to watch the roots develop . . . Step 2 - Set the tulip bulb on top of the marbles or stones