When it comes to deciding how to dry wet documents, vacuum freeze drying is the best recognized method in the restoration industry. A vacuum freeze drying chamber blast freezes wet documents to a temperature of 0 to -20 degrees Fahrenheit, then uses precise temperature and pressure control to vaporize the ice, bypassing the melting stage. A high-tech sensor monitors the rate of weight reduction within the chamber to signal when the drying process is complete and prevent secondary damage from over-drying.