Black soap comes from the tribes of Africa. Although there is a basic recipe, there are also many variations. The recipes change from tribe to tribe and no two seem to be the same. The differences come in the form of the various oils, such as coconut and palm, and the bark and leaves, such as banana and shea trees, that can be included. Each tribe has their own version, using some of the oils and ash and leaving out others. However, the basic recipe is simple, using only one type of tree for the ash and one type of oil. Once you have mastered this, you can start to experiment.