Freezing

Freezing is done in the heritage sector for two reasons. It is a non-toxic treatment of collection pieces against insects, which die from the temperature shock. This method is often used for historical textiles or natural history collections. After severe water damage in archives or libraries, it is also recommended to freeze paper within 48 hours. This stops the run-out of inks and the growth of fungi and buys time to organize the recovery properly.

For price information contact Art Salvage or request a quote.

Description

For freezing large quantities we use a freezing cattle, smaller quantities can be frozen in our freezers.

Treatment method

Objects are wrapped in plastic to protect them from dehydration and condensation. For fragile objects, such as textiles, we first apply support in all folds and cavities. Then the bag goes into the freezer. The insects die from the temperature shock, therefore, the harder you can freeze, the better. If additional benefit reduces/reduces the ice crystals, which can cause less damage to the cell walls of the object. After the necessary time, it is removed from the freezer and let it come to temperature for another 24 hours in the plastic bag, to prevent condensation.

Duration

  • At least 3 full days at -30°C. Extend the term for thick, rolled-up objects or solid wood.
  • Extend to 2 weeks at normal freezing temperature (18-20°C).
  • + 24 hours to acclimatise.
  • Afterwards cleaning all dead remains

Not suitable for

  • Not suitable for certain fragile objects. Be sure to pay attention with:
    • synthetic textiles;
    • objects consisting of composite materials that react differently to the temperature shock, e.g. paintings on canvas, inlays;
    • certain surface layers, e.g. painting, shellac, alkyd;
    • photographic and audiovisual material, excluding acetate film and modern photo prints.
  • Not suitable for wet material or material from a very humid environment, due to the risk of ice crystals. (Except in case of a water calamity.

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