Tuesday, May 3, 2011

Rainbow in a Jar

I came across this book while browsing through the library and thought it would be a great little activity to try!
Here is what you will need......

.....plus a spoon, measuring cup, and a large mason jar or glass cylinder that can accommodate 2 1/2 cups of liquid.

Purple - mix 1/2 cup corn syrup with 1 drop blue and 1 drop red food coloring.  Pour into jar.

Blue - slowly pour 1/2 cup of blue dish soap down the side of your jar.

Green - mix 1/2 cup water with 2 drops green food coloring.  Tip your jar and slowly pour the water down the side of the jar.

Yellow - slowly pour 1/2 cup olive oil down the side of the jar.

Red - mix 1/2 cup rubbing alcohol with 2 drops red food coloring.  Tip your jar and slowly pour the alcohol down the side of the jar.

Here is the finished product!!!

This is a great little science lesson on the density of different liquids and on how some liquids don't mix (water and oil layers).  This book has easy, kid-friendly pictures, instructions, and explanations.

Have fun making your own liquid RAINBOW!


  1. Absolutely love this!! Will try this, looks beautiful too:)Thanks for sharing!!

  2. I'm stealing this for summer camp! :)
    I do a similar experiment but it's with sugar solutions of different concentrations. Each solution is dyed a different color and the students have to figure out how to make a rainbow - if they get it wrong the colors mix and they have to start all over. This is nicer for younger kids b/c the liquids are not miscible if the rainbow is made properly.

  3. Oh Wow this looks FABULOUS! How fun! Good enough to eat! ;-)

    Thank you for linking to Kids Get Crafty!


  4. What happens if you shake it? Will the colors re-split over time?

  5. I just found your blog thorough Red Ted Art. I have to make this with my daughter! She loves The Cat in the Hat episode about Rainbows and sings the song ALL the time. Can't wait to try it!

  6. This is such a a great idea! I can't wait to try it!

  7. I think I just found my wedding center pieces. With some flowers, oh this is gonna be so cute.

  8. Does it matter the order you put the liquids in?

  9. That's my daughter on the cover!! :)

  10. Does it have to be Olive Oil or can it be regular vegetable oil?


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