What is a bath bomb at CW Apothecary?? A bath bomb is a relaxing pampering experience while soaking in your tub. You will indulge your skin with beneficial oils and butters, all while your soft, silky supple, skin relaxes and the bath bomb explodes, and sizzles into beautiful colors and a fresh arome of essential or fragrance oils. You will not want the experience to end. These are a must have.