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Sift the baking soda into a good-sized mixing bowl, this will break up any clumps or lumps that maybe hiding in there.
Apply your face mask, then weigh out and add the SLSA to the baking soda. Stir until well combined.
In a heat-proof container, melt the cocoa butter by giving it a few quick bursts in the microwave, or in a hot water bath. Once the butter has melted, stir the fragrance or essential oil into the butter.
Add the cocoa butter containing the fragrance to the baking soda and SLSA powder. You will need to incorporate this in well so that the butter is fully blended into the powders. I often find using my hands for this is better than a spoon. Once the butter has been added to the powders, and the SLSA has been dampened with the butter, its safe to remove your dust mask.
Add the coloring, a few drops each time until you reach the color or shade that you are happy with.
Now it is time to mix in the citric acid. I find adding this at the end rather than at the beginning with the other powders cuts down the chances of the mixture pre- fizzing.
The bath bomb mix should be damp enough that it will hold together when squeezed. If its too dry you may need to add a spray or two of the Witch Hazel. Just remember, that every time you add a liquid to the mix you chance setting off the citric acid, so always add with caution.
When you are completely happy with the texture of the bath bomb mixture, press it into a mold. Press down firmly so that its tightly packed into the mold with no cavities. You can level the top by placing a piece of waxed paper on top and smoothing it down with a few strokes.
Leave the bath bombs to set for at least 24 hours before trying to remove them.Once these bubbly bath bombs have been removed from the mold, and as long as they feel hard enough, they should be ready to use. If they still feel soft, give them another 24 hours to finish drying out.