What must occur for ossified materials to return to their original conditions after reverse osmosis?

For ossified materials to return to their original conditions after reverse osmosis, the removal of pressure applied during the process is essential. Reverse osmosis involves applying pressure to water in order to force it through a semi-permeable membrane, which separates water from dissolved salts and impurities. When this pressure is removed after the process, the system can return to equilibrium, allowing the concentrations of solutes to redistribute and the water to revert to its original ionic conditions. This return to original conditions or saline concentrations is closely tied to the natural tendency of solutions to achieve balance without the influence of external pressure.

Changes in temperature or pressure used during the process itself do not lead to a restoration of original conditions; instead, they would impact the rate and efficiency of the reverse osmosis process. Therefore, the key to reverting ossified materials back to their original state lies in the removal of the pressure that was initially applied.