Polysorbate 80 is a popular additive for making bath bombs when coloring with mica. It helps disperse the mica in the bath and helps prevent a powder ring around the tub.
Sodium lactate helps cold process soap harden faster, making it easier to take out of the soap mold. Sodium lactate should be added to cooled lye water at a rate of 1 teaspoon per pound of oils.
