Document freeze-drying is a technique that professionals use to dry and restore books and documents that receive water damage. The process involves using a special chamber that has a high-pressure vacuum. When the chamber reaches the optimal temperature and pressure settings, the moisture in the documents sublimates. The sublimation process turns liquid water into gaseous state. Freeze-drying eliminates moisture, prevents or halts mold growth, and avoids complications such as sticking, staining, warping, curling and over-drying. While freeze-drying is an effective solution, it is not the answer for all wet documents.