Through distillation, the turpenes are removed, thereby rendering the folded oil safe for use in leave-on products such as lotions. Shea and mango are very high in unsaps. If they are incorrectly heated, upon solidification they will form little fat granules or crystals that feel bumpy to the skin. These bumps will melt down when rubbed into the skin long enough, but they can be annoying and unsatisfactory if added to a formulation that is supposed to be smooth. To remove the graininess from your shea or mango butters simpoly heat the butter in a doubleboiler on the stovetop.
Gas works best as it keeps a more steady temperature than electric.
This is NOT hot enough to damage the properties of the butters. Keep the temp steady between 170-185F for approx. The steady heat will cause the fat crystals to be obliterated. If you find that crystals have reformed upon solidifcation, go back and repeat these steps, paying attention to time and temp. PEG stands for polyethylene glycol.