Make your own bath bombs! Humans have been using cosmetics for thousands of years! Cleopatra is even said to have bathed in milk to whiten and soften her skin! Bath bombs are made of a hard packed mixture of chemicals, that effervesce or fizz when wet! Ingredients: How to do it: 1) Mix the citric acid and sodium bicarbonate, really well with a whisk! These two ingredients need to be blended well or your bath bombs will be grainy 2) Add a few drops of colorant – what colour will you choose? 3) Add some fragrance oil into the mixture – the more you add the stronger the smell 4) Spritz some witch hazel into your mixture but keep stirring. When the mixture just starts to stick together – it’s ready! (Add too much and it’ll expand and grow ) 5) Put the mixture into the moulds – don’t wait too long, or the mixture will harden. Pack the mixture in as hard as you can – it’ll make the bombs more durable! 6) Wait a few minutes and then tap out your bombs 7) You can now take your bombs home to enjoy – but it’s best to let them air dry for 4 hours before using them! 50g Citric Acid 100g Sodium bicarbonate 3 drops of colorant Fragrance oil to personal preference Baths bombs use the chemical reaction that takes place when a weak acid (citric acid) and a bicarbonate base are mixed in water. This makes carbon dioxide, which is what the bubbles up through the water making a relaxing bath even more luxurious. To make extra moisturising fizzy bath bombs, you can add various oils, such as sweet almond oil, see the instructions for Moisture explosion, for more information! How it works? The weak acid of the citric acid and the alkali bicarbonate of soda are un-reactive when dry but, react vigorously when dissolved in water. Citric acid + sodium bicarbonate monosodium citrate + water + CO2 Science Brainwaves is part of The British Science Association. Registered Charity: 212479 and SCO39236