Letters were originally transported in envelopes in order to ensure privacy as well as protect them from any damage. A record of the first sale of letter envelopes dates back to 1820, by the book and paper trader S. K. Brewer in Brighton. In the course of time such letter envelopes were also being used in archives, libraries and museums for the storage of small, mostly sheeted objects. Today, the use of envelope enclosures is widespread and are a popular tool in the field of preservation and are frequently used for storing cultural artefacts.


The transparent archival paper developed by KLUG-CONSERVATION differs from conventional glassine papers. It is produced free from sulphur, acids, lignin, plasticisers and metals and using 100 % fresh fibres, according to our own formulations. It has passed the Photographic Activity Test (PAT) and is suitable for long-term archiving.
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In addition to storage of photographs, many types of flat objects of cultural value such as letters, graphics, prints, drawings, documents etc. are stored in opaque paper envelopes and pockets. The papers used are all ageing-resistant and available with or without an alkaline buffer.
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Binder pocket pages

Pockets with reinforced fourfold DIN punching are suitable for storage of smaller, flat objects such as photographs, letters, notes etc. They are made of unbuffered, transparent or opaque archival paper.
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Envelopes for documents

Documents are often stored folded in many archives. They are frequently kept in (large) envelopes made of heavy-duty brown kraft wrapping paper. Storage in such envelopes can lead to damage to the documents through the acidic heavy-duty brown kraft wrapping paper. Document envelopes developed by KLUG-CONSERVATION are made of ageing-resistant archival paper or board.
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Seal bags

Seals can be found on historical documents, books or vessels. They were used as marks of authentication, identification or ownership, as a proof of closure or an anti-tamper device on documents and vessels, often to protect from unauthorised opening or adulteration of the contents. A new type of seal bag was developed in 2002 in collaboration with the Diplom-qualified restoration experts Forstmeyer/Schrempf. The material selected and the shape of the bag make it ideal for long-term protection and storage of seals.
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