In a large bowl, whisk together all the dry ingredients.
Break up any clumps with your fingers.
In a small glass bowl, combine the almond oil, essential oils and witch hazel, whisk to combine.
Pour the liquid mixture into the large bowl. (It will fizz once the liquid touches it.)
Begin mixing using a fork (or your hands) until everything looks combined and somewhat moist. It will have the consistency of wet sand.
Prep your silicone molds and use a spoon to fill the molds halfway.
Using a silicone spatula, press the bath bomb mixture into the molds firmly.
Spritz each mold with a bit of water (one spray) and press down again to make sure they're firm. (Note: Using too much water will cause the bombs to lose their fizz. If you don't press down firmly, the bombs will not hold together.)
Divide the rest of the mixture into the molds and again press down firmly.
Spray the top with water and press down again.
Close the molds and let them sit in a cool dry place for twenty four hours to set before removing from molds.