Hidden Colours

Put a drop of food colouring in each cup of the muffin tin and then a teaspoon of baking soda over it to hide the coloring.

Pour vinegar in one tin cup at a time to reveal the hidden colour!

To do this activity again without adding any new baking soda. tip the muffin tin over and let the excess vinegar run into the storage container.

What did you notice happening?

Did you mix any new colours?

Change one of the variables? Use more or less baking soda and see what happens. Pour the vinegar quickly or slowly and see what happens?