I'm sure you all know LUSH bath bombs! Amazingly coloured and fizzy, they make your bath funnier! ...but they are incredibly expensive! If you actually think about the basic ingredients you need for preparing bath bombs you'll be surprised about how much overpriced these branded bath bombs are !!! You basically need citric acid , baking soda and water . In the presence of water, citric acid and sodium bicarbonate (baking soda) react to form sodium citrate, water, and carbon dioxide. Carbon dioxide is the responsible for the bubbling effect. You can find ingredients for making bath bombs in supermarkets for few quid/bucks or buy them from specialized suppliers (http://www.youwish.nl/badbruis, http://www.brambleberry.com/Ingredients-C40.aspx, https://www.soapkitchenonline.co.uk) You can then add colours (I've tried liquid colours and micas), essential oils or skin safe fragrances , herbs and dried botanical , glitters , salts etc. You'll also need: a mixing