In a bowl, combine the cornstarch, baking soda, and Epsom salt. Set the dry ingredients aside.
Add the essential oil drops to the olive oil and mix well.
Gradually pour the infused oil into the dry ingredients, mixing continuously until the mixture holds together like damp sand. If it doesn’t clump, add more infused oil one teaspoon at a time.
Once the mixture is the right consistency, slowly mix in the citric acid. The Citric acid is what triggers the fizzy reaction in a bath bomb when it combines with baking soda and water.
Add the hibiscus powder and mix thoroughly.
Fill your bath bomb molds, packing the mixture tightly so it overflows slightly.
Press the two halves of the mold together and twist until the edges touch.
Gently remove one half of the mold, then repeat for the other side.
Place the bath bombs on a surface and let them dry for at least 24 hours or until they are firm to the touch.