In a large bowl, add 12 ounces of baking soda and 6 ounces of citric acid. To get rid of clumps in the mixture, you can push the powders through a sifter or break them up with your fingers. Citric acid has a tendency to take off nail polish, so wear gloves to protect your manicure. Thoroughly stir the ingredients together. 

Add 0.2 ounces of agave extract, 0.2 ounces of Lush Succulent Fragrance Oil, and about 1/8 teaspoon of Kelly Green Mica. Use your hands to thoroughly incorporate all the liquid ingredients. Add more color if you like.

 Check the consistency of the bath bomb mixture. It should feel like wet sand and hold its shape when squeezed. If it’s too dry, use one hand to spritz the mixture with witch hazel and one to mix. Continue spritzing until the mixture holds its shape. If it does not hold its shape before it goes into the mold, it will not hold its shape once you try to release the fizzy from the mold.

Begin filling each mold with the bath bomb mixture. Firmly press it into each cavity as much as possible. Allow the bath bombs to dry for at least 4 hours or up to overnight. 

Once the bath bombs are completely dry, gently push them out from the silicone mold. To do this, flip the entire mold over on its 'front' and gently (gently) push on the bath fizzy, evenly placing pressure so that the fizzy comes out in one piece. Gravity is your friend in thsi process. To use, place them into a hot bath tub. Enjoy!