Just wondering about polysorbate 80 - how much to use. I'm just trying to add some to my bath salts that have shea butter. I want the shea to blend into the bath water. I know for polysorbate 20, when I'm trying to get fragrance oils to blend into a watery base, I use an equal amount of polysorbate 20 to the fragrance oil. I'm not sure for Polysorbate 80. I could use an equal amount to the amount of shea, but then I've seen a recipe for bath oil that had about 80 percent oil and 20 percent polysorbate 80. I'm not sure about the usage rate. Thanks!