These Witch’s Cauldron Halloween Bath Bombs are super fun and SO easy to make! Topped with a generous layer of bubble frosting, these Halloween bath bombs will fill your tub with a bright and colorful layer of thick foam and luxurious bubbles!
In a large mixing bowl, thoroughly combine 3 cups baking soda, 2 Tbsp. cream of tartar, and SLSA. Stir in 1/2 tsp neon green mica colorant until completely combined.
In a small container, combine the sweet almond oil, fragrance/essential oil, and Polysorbate 80.
Stirring constantly, slowly mix the liquids into the dry ingredients until they are completely combined.
Add citric acid to the bath bomb mixture and stir until it is fully incorporated.
Test to see if the mixture is a moldable consistency - it should feel like slightly damp sand and hold together when squeezed in your hand.If the mixture is not quite wet enough to mold, spritz two to three times with a spray bottle of witch hazel and mix well. Repeat as necessary until the proper consistency is reached.
Fill each of the plastic cauldrons with bath bomb mixture, firmly packed.
To make the bubble frosting, combine 2 cups of baking soda, 1 Tbsp cream of tartar, and 1/2 tsp neon green mica colorant into a large bowl. Add a small amount of the cocamidopropyl betaine to the dry ingredients. Use a mixer to whip the ingredients together, slowly adding more cocamidopropyl betaine as needed, until the bubble frosting becomes a pipeable consistency.
Pipe a generous swirl of bubble frosting on top of each cauldron and top with witch's brew sprinkles.
Allow the bath bombs to dry completely for 24-48 hours depending on the temperature and humidity of your location.
Notes
The amount of fragrance oil and/or essential oil that will need to be added to your bath bomb mixture will vary widely depending on what you are using. Generally, fragrance oil can be added by the 1/2 teaspoon until the desired amount of fragrance is reached. Essential oils are often far more potent than fragrance oil, so we recommend adding 15-20 drops of essential oil to each recipe to start and then adding more in 5 drop increments until the desired level of fragrance is achieved.