These are fun to write with in the bath or to use when washing little hands.
What you will need:
1.5 cup pure soap powder
0.5 cup water
Small containers or ice cube tray
Mix water and soap powder together. Add enough food colouring to get the colour you want. If you'd like more than one colour, divide the mixture into two or three small containers before dding food colouring. Pour the coloured soap into a small container or an ice cube tray or mould it into crayon shapes and let harden before using.
Courtesy of "The Toddler's Busy Book" by Trish Kuffner