K15 Salt IS soluble in lots of things besides water. but of the common household solvents water is most likely to dissolve it. Salt is added to butter to help with the shelf life by combining with the water. I expect that if ghee is made with high heat some salt may be left behind as the water goes off as steam before the fat and water seperate. I add water to salted butter and melt it slowly and draw most of the water [and salt] off before turning up the heat to make ghee in the classic manner. If you plan ahead or make your own butter go with unsalted, the cost is the same usually. My method of removing salt works for me but is a huge time waste and messy.~gd