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1 Freeze drying or lyophilization is a drying method where the solvent is frozen prior to drying and is then sublimed, i.e., passed to the gas phase directly from the solid phase, below the melting point of the solvent.
Pet Preservation Information. Freeze-drying is a method of preservation which eliminates the decaying process inherent in the living tissues of plants and animals. Through a combination of very low temperature and vacuum application, all moisture is removed, leaving the tissues otherwise unaltered.