Bath Bomb Bubble Frosting Recipe

Bath Bomb Bubble Frosting Recipe

This bath bomb frosting is designed to pipe easily, hold its shape, and dry firm while producing extra bubbles in the bath.

Ingredients

Dry Ingredients

• 200 g Sodium Bicarbonate
• 100 g Citric Acid (finely sifted)
• 25 g Cornstarch or Tapioca Starch
• 10–15 g SLSA (optional, for added bubbles)
• 10 g Meringue Powder or Egg White Powder (optional, for a firmer frosting)

Liquid Ingredients

• 20 g Glycerine
• 3–5 g Fragrance Oil
• 5 g Polysorbate 80 (optional, especially if using mica or fragrance oil)
• Water-soluble dye or mica (optional)
• Distilled water in a fine mist spray bottle

Method

1. Sift the sodium bicarbonate, citric acid, cornstarch (or tapioca starch), SLSA, and meringue powder together until completely smooth and free of lumps.
2. In a separate container, combine the glycerine, fragrance oil, Polysorbate 80 (if using), and colour.
3. Slowly add the liquid mixture to the dry ingredients while mixing on low speed.
4. Lightly mist the mixture with distilled water, one or two sprays at a time, mixing well after each addition. Continue until the frosting reaches a thick buttercream consistency that holds stiff peaks and pipes easily. Avoid adding too much water, as this may activate the bath bomb ingredients prematurely.
5. Transfer the frosting to a piping bag fitted with your desired nozzle and pipe onto fully cured, dry bath bombs.
6. Leave the decorated bath bombs to dry for 24–48 hours in a cool, dry environment before packaging.

Tips for Success

• Wear a dust mask when handling SLSA, as the fine powder can irritate the respiratory tract.
• Work in a low-humidity environment whenever possible.
• If the frosting is too dry, add one or two more sprays of distilled water.
• If it becomes too soft, mix in a little more sodium bicarbonate until the desired consistency is reached.
• Keep fragrance oil at or below approximately 1% of the total batch to help maintain a stable frosting.

This recipe produces a stable, pipeable frosting with good bubble performance and is suitable for decorating bath bombs.