Ice Cube Experiment

What to do:

  1. Start with an ice cube for each child.
  2. Ask the child to put only a few pieces of rock salt (used to melt sidewalk ice) on top of the ice cube.
  3. Have each child then drip a couple of drops of food coloring onto the rock salt.
  4. Allow the ice to sit for a few minutes, observing the melting salt. Tunnels will develop in the ice as the rock salt does its work, and the food coloring makes the tunnels visible.


  1. Freeze large chunks of ice in milk cartons, remove the ice from the carton, and do the same experiment on a larger chunk of ice.