If you’d like to make a different size or amount, adjust the recipe while keeping the proportions the same. For example, if you wanted to make 2 softball-sized bath bombs, you’d start with 2 cups (440 g) of baking soda instead of 1 cup (220 g).
You can use any type of salt you want. Epsom salt is a class choice for bath products, but you can also try sea salt or non-iodized table salt. [2] X Research source If you can’t find cornstarch, add 1/4 cup (55 g) of baking soda and 1/4 cup (60 g) of salts. Keep in mind that this will cause the bath bomb to fizz more and last not as long. [3] X Research source
Don’t worry too much about doing this perfectly. The goal here is to mix up the dry ingredients. You can even put them into a sealed jar and shake the jar.
The oil is optional, but it will make the bath bomb more nourishing for your skin. Vegetable oil, sweet almond oil, coconut oil, or olive oil are all great choices. The food coloring may be difficult to mix into the oil, especially if it is water-based. Consider using an oil-based food coloring instead. [4] X Research source Avoid getting the essential oil directly onto your skin as it may irritate it. Once the oil is in the bath bomb, however, you’ll be fine.
Wear plastic gloves to keep the mixture from staining your hands. [6] X Research source
You should end up with a mixture that is crumbly but holds its shape when squeezed together. [7] X Research source
If you’re using the popular Christmas decoration option, overfill each half of the ball. Press the 2 together lightly. [8] X Research source
If you try to remove it prematurely, it is more likely to fall apart. [9] X Research source Rinse all metal tools carefully. Epsom salt can corrode metal over time. [10] X Research source
It’s best to use a bath bomb within a few weeks. Older bath bombs lose their effervescence. [11] X Research source
Plastics can soak up undiluted essential oil, but this is less likely to happen after you’ve mixed everything together. The most popular “mold” is a spherical plastic Christmas ornament. Look for the 2-part, snap-together type of ornament commonly sold at craft stores. It will make the round, softball-sized shape often seen in commercial bath bombs. Chocolate molds come in many cute shapes that are perfect for making bath bombs. Tart and cupcake tins also work well. [12] X Research source
A bath bomb that looks pretty when you make it may not necessarily make the best-looking bath. Keep a record of which combinations you’ve tried and which work out best. Make sure to always use dyes that are non-toxic, non-staining, and water soluble.
4 parts spearmint to 1 part patchouli 2 parts orange to 1 part vanilla 1 part patchouli to 1 part cedarwood to 2 parts bergamot 1 part peppermint to 1 part tea tree to 2 parts lavender Equal parts lavender and peppermint
