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Rainbow Science

It is spring, which means rainy days and

if we are lucky: rainbows!

Rainbow Volcano


  • Baking Soda (about 1.5 cups)

  • 7 small cups (I use Dixie cups for easy clean up)

  • Food coloring or Koolaid mix (red, orange, yellow, green, blue, indigo, and violet)

  • Gallon of vinegar

  • A place to make a giant (but fun) mess


  • Fill each cup about 1/4 to 1/3 full with baking soda

  • Squeeze one to two drops of food coloring in each cup

  • Arrange cups like a rainbow (red, orange, yellow, green, blue, indigo, and violet)

  • Quickly pour vinegar over all cups and watch it foam

  • Repeat until you are out of supplies!

Rainbow Fizzies


  • Food coloring (red, yellow, blue)

  • Baking soda (about 1/2 cup)

  • Vinegar (1/2 cup)

  • Droppers or spoons

  • Clear dish


  • Cover the bottom of a clear dish with a layer of baking soda

  • Drop food coloring in three sections (about 4 drops of each color)

  • Use droppers or spoons to drop vinegar over color spots

  • Repeat until colors blend and create each color of the rainbow

Rainbow Skittles


  • Package of Skittles

  • Warm water

  • Clear dish


  • Place Skittles around the edge of the dish in rainbow order (there is not a blue/indigo in the original Skittles package. You may want to purchase the tropical package if you would like to be a little more accurate).

  • Pour warm water in the center of the dish - at first only 1 cup of water.

  • Watch as the colors begin to disperse in the water

  • Pour additional warm water until the Skittles are completely submerged.

  • Watch as the colors continue to spread and then see if you can find a floating "s" from the Skittles.

Rainbow Shaving Cream


  • Shaving cream (foam not gel)

  • Red, yellow, and blue food coloring

  • Plastic wrap

  • Masking tape


  • Cover your work area with plastic wrap and tape it down using the masking tape

  • Place three blobs of shaving cream on the plastic wrap

  • Using the food coloring squeeze 1 - 2 drops of coloring on each shaving cream pile (red, yellow, and blue - separately)

  • Place shaving cream on top of the food color droplets

  • Have your children mix the colors until the have created a rainbow

Note: Using gel food coloring is best.

Want to incorporate literacy and art? Look out for another blog post tomorrow!


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