Source: Homemade Bath Bombs – A Beautiful Mess
Homemade Bath Bombs, makes two large size or 3-4 “Easter Egg” size depending on your mold (you can easily double or triple)
4 oz. baking soda
2 oz. corn starch
2 oz. citric acid
2 oz. Epsom salt
1 to 1 1/2 teaspoons water
1 teaspoon essential oil
1 1/4 teaspoon oil (I like coconut or olive oil here)
1-2 drops food coloring (optional)
In a bowl combine the dry ingredients (the first four listed above). Whisk to remove any clumps, corn starch tends to be clumpy. In a small glass jar stir together the wet ingredients (the last four ingredients listed). If you’re using coconut oil, give it a quick melt in the microwave or stove top first so it will more easily combine with the other ingredients. Slowly pour the liquid mixture in with the dry mixture, whisking as you go. If you see the mixture fizz or foam, you may be adding the liquid too quickly. Once all the wet ingredients are combined with the dry, take a small amount in your hand and squeeze it together. It should stick together fairly well in one or two big chunks. If it’s still too powdery to hold together, just add a tiny bit more water and mix until it does hold together. You can really see this in the video tutorial—so watch that if you are unsure about how much it should stick together.