Chamber is loaded with frozen materials, sealed, and the pressure is lowered to create a continuous vacuum. Temperatures are raised slightly to release water vapor without causing a change from solid to liquid. Vapors are pulled up to a cryogenic panel, converted back to solid form, and removed from the chamber. Photographic Materials Seek the services of a professional photographic consultant. Separate wet prints and negatives as soon as possible.
Air drying without freezing is best for prints.
Microforms Clean mud and debris from film. Film can be rinsed, but should not be allowed to dry before being reprocessed. Dirt and debris may be more damaging than water. Books and documents damaged by heat may be photocopied if not rare or valuable. Soot and smoke deposits on paper are difficult to remove.