Bubble bath bombs typically contain a series of dry ingredients that cause a foaming reaction when they come into contact with water. Common key ingredients in bubble bath bombs include: baking soda, citric acid, magnesium sulfate, essential oils, and pigments. Of course you can also add dried flowers, bath salts, toys and other decorations. Among them, baking soda is the main ingredient in bath bombs. In addition, you also need a mold. Ball-shaped ones, dinosaur egg shapes, flowers, clouds, etc. are all popular. Of course, you can also choose the shape and color you like.