If the core of the brownie, cookie, or bar is still hot, cooling may not be sufficient to overcome the thermal transfer of heat from the core of the bar to the coating, resulting in undesirable crystal formation and fat bloom on the surface. If sufficient cooling is not possible, addition of seeding agents, such as monoglycerides, diglycerides, and sorbitan tristearate, to help with nucleation to set proper crystal growth has been shown to be effective.