In a bowl mix:
- 1 cup baking soda
- ¾ cup corn flour
- ½ cup citric acid
- ½ cup Epsom salts (optional)
In a spray bottle mix:
- water
- essential oil
- food colouring (optional)
Gently spray the dry ingredients a little at a time. This is a tricky and time consuming process as you want to wet the ingredients enough to compact them into shape but not so much as to set the baking soda off.
Press into moulds, silicon moulds or cupcake pans work well (or simply mould into balls in your hands).
Allow to dry 24 hours.