In a large mixing bowl, whisk together the baking soda, citric acid, dead sea salts, and cornstarch.
Add the coconut oil to hold your dry ingredients together so they maintain their shape and don't crumble.
Then add the polysorbate 8 to help disperse the coconut oil evenly in the bathwater and make your bath bombs bubbly.
Next, add the Shea butter to help bind the ingredients together and moisturize skin too.
Add the scented oil and mix well. If needed, use your hands to break up any clumps. Once your mixture feels like wet sand and can hold its shape, it's ready for the next step.
Then add 1-2 drops of the yellow color to one bowl and mix well. Don’t add more than 1-2 drops at a time because your mixture will foam up. Repeat the same process with the rest of the colors in the other 5 bowls. If the mix is not dark enough add only 1-2 more drops of the color. Be sure to add in the glitters to their coloring matching bowl of mixture.
Layer the red, orange, and yellow in one of your bath bombs molds. Then add the purple, blue, and green in the other half. Do this until the mixture is slightly overflowing on both sides. Press molds together and grind to remove the excess mixture.
Gently tap each side of the mold to release the bombs without breaking them. Allow to dry a minimum of 24 hours.