Apply to the chromatogram with a toothpick. Any of the separated colors could simply be remixed in water. Physical changes are reversable. Chromatography is a method of separation for pigments or dyes by using different rates of evaporation for the component substances. Chemists can use more complex forms of this method to analyze a sample to determine its contents.
Homogeneous matter is the same throughout and in only one phase of matter.
Heterogeneous matter is composed of a mixture of substances that can usual been seen with the naked eye. Heterogeneous matter can be separated by physical changes. SAND AND SALT could be separated by dissolving the salt in water and filter the sand from the solution. Evaporation of the water would recover the salt. You might divide the candies by pouring some into a small bathroom paper cup and pass them out to the students.