Our bath bombs are "painted" with skin safe micas (the same kind used in cosmetics) mixed with isopropyl alcohol, and the bath bombs are filled with brightly colored embeds and feature a variety of pleasant fragrances.
We test our colors carefully to ensure that they won't stain your tub, but to be sure you won't have to do any scrubbing we recommend using bath bombs in a clean tub without a filmy residue. Also, remember that the oils and butters that make bath bombs so soothing to your skin can leave the tub a little slippery (although we do use polysorbate 80 which helps reduce this possibility), so use caution when standing up to exit the tub.