Cream of tartar is often used in bath bombs and bubble bars to help create a better fizz and more bubbles when added to water. Cream of tartar is also known as potassium bitartrate or potassium hydrogen tartrate. Cream of tartar is often used in bath bombs and bubble bars to harden them. This helps the bath bombs and bubble bars keep its shape when put in water. It also has a binding effect which can help hold the ingredients together. Because of its fine texture, it smooths out the mixture, giving the bath bombs and bubble bars a smoother and silky texture. When adding cream of tartar to bath bombs along with citric acid the bath bombs will fizz more and make more bubbles. Cream of tarter is a white powder