Walking Rainbow

Learning Objectives
Children will…
• define capillary action.
• observe color mixing.

Key Question
How can we make a rainbow with three colors?
Vocabulary (See What the heck? Explanation of Science at the end for definitions.)
Capillary Action
Cellulose

Materials
6 mason jars or clear plastic cups
Food coloring (red, blue, yellow)
Timer
Paper Towels

Special note about the primary colors: While red, blue, and yellow are used here for this experiment because they are the easiest colors to source, they are NOT the real primary colors of dye, paints, or pigments. The REAL primary colors are cyan, yellow, and magenta. Sometimes if you get neon food coloring, you will find cyan (turquoise) and magenta (pink) food coloring. Learn more here: https://stemazing.org/realprimarycolors/

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