How to make a bicard 'fizzer':
1) First, sieve the bicarbonate of soda, laundry starch, and citric acid into a bowl and mix together with a spoon.
2) In a jug, mix together the olive oil, food colouring and essential oil.
3) Gradually add the wet mixture to the dry mixture, stirring together as you go. As soon as it forms a solid lump, stop adding the wet mixture. It is not essential that it is all used, as too much will prevent the bath fizzers from binding together.
4) Next, roll the substance between your hands to make 'ball' shapes. Leave to harden overnight.
5) To add a decorative touch, wrap the bombs in tissue paper and tie with an attractive ribbon.
