Note: You can do this same experiment using water-based color markers instead of using food coloring. We suggest you use a black marker on one strip, and a green marker on the second strip.

In a small plastic cup, add 2 drops of green food coloring ... Place the wet end of the swab in the center of the food coloring dot so that water can absorb into the coloring and the filter. Lay the ...

Students will also add water and salt water to green food coloring on a coffee filter. They see a distinct difference in the way each liquid makes the colors in green food coloring separate. Make ...