Display the image and explain that today we are going to conduct our own art experiment to create this effect.
Ask how they think the design was created.
Pour baking soda into a small pan and shake gently so that the baking soda is in an even layer. Set aside.
Pour ½ cup of vinegar in each bowl.
Squeeze about 6 drops of food colouring in each bowl of vinegar and stir well.
Fill the dropper with the coloured vinegar.
Squeeze the coloured vinegar into the baking soda and watch it fizz!
Repeat with other colours!