Freeze drying

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Contributors: Alex Garcia-Putnam

Through low pressure and freezing temperatures, sublimation can occur, dehydrating or removing the water from an object.

Related Terms[edit | edit source]

sublimation, lyophilization

Synonyms in English[edit | edit source]

Translation[edit | edit source]

English freeze-drying
French lyophilisation
Chinese (Traditional) 冷凍乾燥

Discussion[edit | edit source]

Freeze-drying allows the water to be removed from an object in a controlled way. This is critical in the conservation of waterlogged artifacts, such as those from maritime environments. Freeze-drying can be done by simply freezing the object at a low temperature which allows natural sublimation to occur, or in a more aggressive treatment such as vacuum freeze-drying, where the drying takes place in a vacuum (CCI 2013).

Wooden artifacts respond well to freeze-drying, as do metals and other artifactual materials. Bone however should never been freeze-dried, as it will degrade rapidly under such conditions (CCI 2013).

References[edit | edit source]

CCI. 2013. Vacuum Freeze-Drying Archaeological Artifacts.

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