4 parts sodium bicarbonate (baking soda) to 2 part citric acid. You can get this from the chemist or from the supermarket. Make sure it's suitable for culinary use.
Mix the two together and sprinkle over your bath. It's simple, cheap and fun!
As a variation, if you add 1 part scented oil and mix well, then put the mixture into moulds, you can use this recipe for fizzing bath bombs.
By Beth from West Sussex, England
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