Potassium salts of fatty acids should yield soft soaps because they are more soluble in water than sodium salts of fatty acids (which yield hard soaps). They contain more water, so they are softer.
soap oleate....... Fatty acids are the bi products of amino acids. From http://dl.clackamas.cc.or.us/ch106-04/triester.htm "A soap essentially is a fatty acid salt. Usually it is the sodium salt of a...