A great moisturizing Bath Bomb will have just enough oil and or butter to soften your water and leave you feeling silky, soft, and moisturized.
Last time we talked about how to determine just how much oil and or butter is needed per bath bomb and how to apply that measurement to your recipe. So now that you have your recipe adjusted to have just the right amount of the oil and butter combination, we will need to add some type of emulsifier to disburse them throughout the water.
Our choices are a bit limited and each of the two suggested additives bring a different attribute to the finished product. Let's begin by discussing each one and the affect it will have on the Bath Bomb.
SLSASLSA or sodium lauryl sulfoacetate and also known as Lathanol - According to Brambleberry the description of SLSA is: A fine white powder is excellent for blending into "bath bombs," bath fizzies, powdered bubble baths, bath salts for super foam, scrubs and more. Makes a blanket of bubbles that last! Long lasting SLSA powder provides excellent foam and viscosity response.
When used as an emulsifier in Bath Bombs only a tiny amount is needed. We recommend 1/4 to 1/2 teaspoon per 5 pounds of Baking Soda. This amount perfectly emulsifies the butters and oils with the tub water. Using a tiny amount will usually not affect the bath bomb mixture and rock hard bath bombs can still be produced with ease.
In the water the Bath Bombs will release a small amount of foam that usually will disapate fairly quickly after the Bath Bomb has finished it's fizzing. A small amount of SLSA will also not interfere with the fizzing action of the bath bomb.
So in conclusion, when using SLSA in small amounts you can acheive hard bath bombs that will emulsify your oils and butters into the water and create a small amount of foam. Using large amounts of SLSA in your bath bombs will give you a bubbly bath bomb and less fizzing action. Usually the mixture will be hard to mold or release from the mold, and when dry your bath bombs will likely be soft and easily dented.