Surprise a friend or family member with this Saint Patrick's Day inspired Hidden Rainbow Bath Bomb!
Add the baking soda, citric acid and corn starch to a mixing bowl. Stir well to combine.
Add a few drops of your favorite essential oil.
Carefully add some rubbing alcohol or witch hazel to the mixture. This will make the bath bomb mixture clump together. I usually add between 1 to 3 teaspoons of liquid. Keep stirring.
Check the consistency of the bath bomb mixture in between by taking some in the palm of your hand and squeezing it. It should clump together like damp sand.
Fill up both sides of your mold with the white bath bomb mixture and press it down with your fingers. Choose 5 liquid soap colors. Carefully place 3 drops of each liquid soap coloring on top of one side, in a star shape. Make sure the drops are spaced out evenly and stay away from the edges.
Top both halves with another layer of white bath bomb mixture and press both sides together. Tie an elastic band around your mold to make sure it stays close.
To paint the golden shamrock on top, I mixed a little edible glitter with some rubbing alcohol and painted it on with a paint brush. Enjoy!