Here's an activity that will change how one sees color. Pupils try out an experiment on chromatography where they place a drop of food coloring on a coffee filter, add several drops of water, and watch the colors spread and separate. They then repeat the process using salt water.

Concepts

color, chromatography, mixtures, separating mixtures, pigments

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Instructional Ideas

• Have learners try out different inks
  

Classroom Considerations

• Activity requires coffee filters, green food coloring, cups, cotton swabs, salt, and water
• Prior knowledge of chromatography is not necessary
  

Pros

• Directions are easy to follow
• Includes a printable handout
  

Cons

• None