Freeze drying breast milk is done through a process called sublimation. This is where rapid subzero -28.9C (-20f) freezing happens to the milk, it then is held under vacuum, and a series of gentle warming pulses occurs causing sublimation to occur. Sublimation is the transition of solid state water “ice” to vapor, bypassing the fluid liquid state of water. The frozen ice instantly transforms into water vapor. The water vapor then is drawn out and collects on the outer cylinder wall leaving a fine powder. BoobieJuice applies gentle human body temperature range warming curves to vaporize solid ice into water vapor. These body temperature ranges help ensure we create macro dense, nutritious breast milk powder.