These black bath bombs get their color from black sea salt.
Ingredients
About 8-10 Disk & Mold Packages
2 cups Baking Soda (Sodium Bicarbonate)
1 cup Citric Acid
1 cup Black Sea Salt – Fine
2-3 oz. Black Sea Salt – Coarse
1 oz. Sweet Almond Oil
0.5 oz. Sultry Black Jasmine Fragrance Oil
0.6 oz. Polysorbate 80
Witch Hazel in a Spray Bottle
Instructions
In a large bowl, mix together 2 cups baking soda, 1 cup citric acid, and 1 cup fine black sea salt. To get rid of clumps in the mixture, you can push the powder 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.
In a separate fragrance oil-safe container, mix together 1 ounce of sweet almond oil, 0.6 ounces of polysorbate 80, and 0.5 ounces of Sultry Black Jasmine Fragrance Oil. Stir to combine.
Add the oil mixture to the salt mixture and use your hands to thoroughly combine.
Test the consistency of the bath bomb mixture. The perfect consistency for molding is a texture similar to damp sand that holds 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 when squeezed. Below, you can see that the mixture forms a ball when squeezed. This means that the mixture will hold its shape in the mold as well.
Sprinkle a small amount of the coarse black sea salt into the bottom of the Disk Mold & Packages. Then, press the bath bomb mixture into the molds. Press the mixture firmly to create a solid shape. Only fill the molds up to the bottom lip, or the lids will not fit.
Continue filling up each mold with bath bomb mixture. Allow the bath bombs to dry for several hours or up to overnight. Remove from the molds. Place the bath bomb into hot bath water and enjoy!
Recipe by Soap Queen at https://www.soapqueen.com/bath-and-body-tutorials/black-salt-bath-bomb-diy/