One folks master melt and pour soap making, and cold process soap making, they generally inquire about making liquid soap. It's very like cold process bar soap in how the oils and lye are mixed together and brought to trace. But it uses potassium instead of sodium hydroxide and it's a "hot process" (meaning you add heat to it) soap instead of cold. There are lots of variations in the recipes and how to formulate them, but the final soap still lathers and cleans. It can be a finicky soap process...but it's a worthwhile soap adventure!