Pour 2 cups of water into your pot or saucepan and bring it to a boil.
While waiting for the water to boil, mix 1 cup cornstarch with the remaining 1 cup of water. Stir until the starch is fully dissolved.
When the water begins to boil, remove the pot from heat and add the cornstarch and water mixture. Place the pot back on the heat and stir constantly. Allow the mixture to boil for approximately 1 minute while stirring until the mixture is clear and thick.
Remove and Separate
Once the mixture is thick and clear, remove the pot from heat and separate the mixture into different bowls or containers as you see fit. Base this segregation on the number of colours you would like to create.
Allow the mixture to cool.
While the mixture is cooling, add food colouring bit by bit to create the desired colours. Mix the colouring into the mixture well in order to ensure that it is even.
Once mixed and cooled, the paint is ready to use. Let your kids dip their fingers and create their works of art.