The next step is to only use cold aqueous phase. The hot-cold process avoids heating the aqueous phase, but during emulsification mechanical energy consumption is higher because the fast cooling caused by the release of the cold aqueous phase produces a rapid increase in the viscosity of the emulsion, which requires a greater rotary effort from the stirring unit.

The following page shows the performance of the same emulsion made with the hot-hot and the hot-cold system. As can be noted, despite the rapid increase of the viscosity, the time/energy saving is greater than the normal hot/hot process.