I have not tried this yet so the recipe may need to be tweaked (maybe not).
Foaming Bath Balls
1 cup Citric Acid
2.5 Cups Baking Soda
1/4 cup of SLSa
1/4 cup Cream of Tartar)
1 teaspoon coconut oil
1 spray bottle of Distilled Water, Floral Hydrosol, or Witch Hazel
1/4 - 1/2 oz fragrance oil
Step 1. Mix dry ingredients in a bowl. If coconut oil is solid, warm it in the microwave and then blend your fragrance oil into it. Add color, fragrance/coconut oil mixture, and any herbs if desired (like chamomile powder, rose petal powder, kaolin clay, etc.)
Step 2. After you have your ingredients blended in your bowl, mist over the contents in the bowl with your water (or hydrosol or witch hazel), while continuing to mix well until you reach a ‘grainy’ or cornmeal type texture.
Step 3. Test your bowl ingredients by taking a handful and squeezing hard. When you are at the point that your mixture will stick together when compressed, stop misting with the spray bottle of liquid. Your mixture must be damp enough to stick together when compressed, but not too wet
Step 4. Using your mold such as a 2 piece plastic Christmas ball, scoop mixture up with both halves of the mold, overfilling both halves. Quickly press the two halves of the mold together, compressing the excess mixture into the center of the mold. Press hard and hold for about 15 to 20 seconds.
Step 5. Gently release the two mold halves from your bath ball. If you have difficulty, tap each side gently with the back of a spoon.
Step 6. Set bath ball to dry for 24 - 36 hours. When dry and hard, shrink wrap.