Try this fun and easy Grow a Rainbow Experiment. Kids will love watching the water travel and seeing the new colors being made in this easy science experiment! More Science Experiments for Kids Note – if you would like to do the experiment in a circle instead of a straight line to save space, just make 1 red cup and place the cups in a circle (as shown in the first image). Now your walking rainbow is complete! You can now see each color from the rainbow in the cups and your empty cups have now been filled with the secondary colors – orange, green and purple! Wait 2-3 hours for the empty cups to fill with the new color that is mixed from the other 2 cups. Walking Papers is a blues-rock band formed by Jeff Angell and Barrett Martin, two long-serving veterans of the Seattle music scene.

The water and dye will immediately start to move up the paper towel into the empty cups.Īnd red and yellow will mix to make orange.ħ. Place a paper towel into each cup and connect with the empty cups.Ħ. Fold over 6 pieces of paper towel (half sheets) and trim about 1/4 off the end so they are not too long.ĥ. When the colors mix then the order of the rainbow will show this way.Ĥ. Place the cups in a line starting with red on each end. Once the colors mix, if they are too concentrated then the purple will look more black than purple.ģ. If using regular food coloring you may need to add a few drops.įor the red and blue, make sure this is not too concentrated. Add 1 drop of red food coloring to two of the cups, 1 drop of blue food coloring to one of the cups and 1 drop of yellow to one of the cups. The more water there is, the faster the walking water will travel.Ģ. Fill the water to almost the top of the cup. Start by filling up 4 clear cups with water.

Walking Water Experiment Step-By-Step Processġ. Paper towels are made from fibers found in plants, called cellulose. This same phenomenon is what allows trees to get water from the ground with their roots. The water moves upward through the paper towel, lifting the food dye molecules with it. Kids can learn about how secondary colors are formed when the orange, green and purple colors are made in the empty cups.Ĭapillary action is what makes the dye move up the paper towel. This science experiment is a great example of coloring mixing and capillary action. What is the Science Behind This Experiment?

Food Coloring – we like the liquid gel food coloring (you just need 1 drop) but regular food coloring works too.Here is what you will need for this activity: Walking Water Experiment Step-By-Step Process.What is the Science Behind This Experiment?.

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