Start by mixing together the Epsom salt and mica powder. Reserve 1 tsp of the colored Epsom salt

If you’re not using mica powder, skip this step.

Mix together baking soda, remaining Epsom salt, citric acid, and corn starch. Add in coconut oil and essential oils, mix thoroughly. Slowly add in water, mixing well. The mixture should be the consistency of wet sand, holding together when you press it together.

Add a small amount of the reserved colored Epsom salt (if using) and sprinkle it in the bottom of the bath bomb mold.

If you’re using multiple colors, you can layer them.

Pack both half of the bath bombs with mixture, slightly over filling each half. Firmly press halves together and set aside on a piece of parchment paper.

Let the bath bombs set for at least 15 minutes and up to 2 hours. Use a spoon to gently tap the sides of the mold, then remove the bath bomb.

Let bath bombs dry for 24 hours before storing in a container away from water. Bath bomb will last for up to 6 months.