This Science Factory Make Your Own Bath Bombs Kit will help your kids have a blast with the fizzy fun! With everything you need to create their own bath bombs, it's the perfect way to encourage exploration and discovery for 8 years and up. Create colourful, scented bath bombs and enjoy the bubbly fun!. 1 x The Science Factory Make Your Own Bath Bombs Kit. Creates 5 bath bombs. Lemon fragrance. 8 years +. Kit includes 3 moulds, 1 lemon fragrance (5ml), 3 muddlers, 1 bag of citric acid (50g), 1 bag of backing soda (100g), 2 pigments (blue colouring 10ml, red colouring 10ml), 1 spoon, 1 measuring cup, 1 baby oil (10ml), 1 guide book