In a large bowl, add all dry ingredients (baking soda, cornstarch, epsom salts and cream of tartar) and whisk together.
In a separate bowl, mix all wet ingredients, (oil, essential oil, food coloring (2-6 drops) and water.
Now slowly pour your liquid ingredient mix into the dry mixture, whisking them together slowly. The texture should be crumbly.
Scoop a generous amount into your mold, packing it down. If you're using a plastic, fillable ornament, fill one side, then the other, then squeeze the halves together, wiping away excess mixture at the seam. If you want to add a little trinket or note inside the bath bomb, press it into one side of your ball.
To release a bath bomb from the round mold, tap the outside mold shell with a spoon to loosen it. Then turn it over, and repeat the process with the other half.
Lay your bath bombs out on a cookie sheet to dry overnight.
The fun part about DIY bath bombs is the customization! You can open a green tea bag and sprinkle in tea leaves, experiment with different essential oils, add real lavender or orange peel, and for the bravest of brave — microglitter. Have fun trying different colors and molds!
If you're giving these as gifts, some fun ways to package them are in little drawstring mesh bags, cellophane bags, inside cupcake papers or even several in a large Mason jar.
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