#MakeItMonday: Fireworks in a Jar

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#MakeItMonday – Watch for DIY content Mondays throughout the summer!


(Safe!) Fireworks in a Jar

You will need:

  • 2 small plastic cups
  • Vegetable oil
  • Fork
  • Blue and red food coloring (we used leftover coloring from Science Academy: Bath Bomb Lab!)
  • Large clear container

How to make:

Step 1: Pour a small amount of oil into the individual cups.


Step 2: Add food coloring to each cup.

We started with 10 drops but eventually added 30 to each cup. (This was probably too much since our water turned blue right away!)


Step 3: Mix the oil and food coloring as much as possible using the fork.

Look at all the little dots of the coloring!


Step 4: Add the oil and food coloring mixture to the water.

Watch as willow-type fireworks break out!



What we learned:

Oil and water don’t mix.

Water molecules are polar – they have a small positive charge at one end, a small negative charge at the other end, and they stick to each other. Oil molecules are non-polar which means they have no charge. Because of this, oil molecules are more attracted to each other than to water molecules, and water molecules are more attracted to each other than to oil molecules, so oil and water don’t mix!


Oil and food coloring don’t mix.

Food coloring is mostly made of water!


Oil floats on top of water.

Oil is less dense than water (a spoonful of oil weighs less than a spoonful of water), so it is lighter and it floats to the top. Water is denser, so it’s heavier and it sinks to the bottom.



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