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*Ensure that stores are kept at the temperature and relative humidity appropriate for the objects according to national, regional or local recommendations. It is generally accepted that there is an increasing risk of microbiological activity above 60% relative humidity, and increased brittleness at a very low relative humidity. However across Europe with its variety of climatic zones, different limits have been recommended and there is no general agreement, either upon temperature or humidity, but it is established that most archive categories last longer at lower temperatures and at lower relative humidity. Reference should be made to national, regional or local standards and bibliographical information for these can be found on the ARCHES website [BIBLIOGRAPHY].
*Ensure that stores are kept at the temperature and relative humidity appropriate for the objects according to national, regional or local recommendations. It is generally accepted that there is an increasing risk of microbiological activity above 60% relative humidity, and increased brittleness at a very low relative humidity. However across Europe with its variety of climatic zones, different limits have been recommended and there is no general agreement, either upon temperature or humidity, but it is established that most archive categories last longer at lower temperatures and at lower relative humidity. Reference should be made to national, regional or local standards and bibliographical information for these can be found on the [BIBLIOGRAPHY] part of the ARCHES website.
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!4.4. Long term curation of the documentary archive
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See [STANDARDS for archaeological archiving] Chapter 2.
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*''Digital data''
**All files should be provided with data documentation. Data documentation enables clear access to the data and helps prevent loss of information during the process of data refreshment and migration, as the character of the data is well understood. All files should be provided with sufficient metadata to ensure that the data in the file can be easily accessed and understood. This will enable digital data to be useful to someone other than its creator in years to come.
**Data refreshment should be practised. Digital data should be checked for readability on a regular basis, and where necessary data should be copied from one magnetic or optical medium to another as the original nears the end of its useful life.
**Data migration should be undertaken according to current best practice principles in data and information management, which can change rapidly. To make files independent of the machines and the software they were made with, files for archiving should wherever possible be transferred from proprietary formats onto stable and persistent preservation formats, and migrated onto successive versions of these formats as software updates or changes (Examples are .xml for text and spreadsheets, .jpg and .tiff for images, and .dxf and .svg for vector drawings. Proprietary formats such as .doc, .pix, and .ai should be avoided. Sometimes a proprietary format is allowed because it is widely accepted –de facto- standard such as the .pdf format (PDF/A (ISO 19005)). All files and metadata should be validated during this process and earlier versions should not be discarded until the newer one has been checked.
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It is not possible to discuss in detail the standards for digital archiving in this Guide. Detailed guidance on digital archiving can be found in the OAIS reference model ([OAIS - Open Archival Information System (ISO 14721)|http://public.ccsds.org/publications/archive/650x0m2.pdf]), the Guide to Good Practice section of the Archaeology Data Service website ([http://Guides.archaeologydataservice.ac.uk/]), the Digital Archiving and Networking Services (DANS), and websites that follow or instigate developments and discuss these, such as JISC ([http://www.jisc.ac.uk/about])and the Forum on Information Standards in Heritage (FISH)([http://www.fish-forum.info/]). For more information on how data can be linked and openly accessed and re-used the site of Linked Open Data is a good starting point ([http://linkeddata.org/home]). A practical guide on how to organise research data is given by the UK Data Archive (Van den Eynden, V. et al 2011. “Managing and sharing data; best practices for researchers” University of Essex, Colchester, Essex [http://www.data-archive.ac.uk/media/2894/managingsharing.pdf]).
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*''Analogue documentation ''
Analogue images and documents may take different forms with specific archiving requirements. Several general points may be articulated:
**All paper should be stored flat in acid free, dustproof cardboard boxes.
**Drawings on drafting film should be stored flat in dust free containers.
**All paperwork should be fully indexed and separate classes of documents should be grouped together. An overall archive index and a title sheet marking different groups of documents should be present.
**Documents of the same type should be organised in a logical order, by context, date and object number as appropriate.
**Any binding or labelling which could damage analogue information, such as elastic bands, staples, paperclips or self adhesive labels or tapes should be removed.
**Boxes should be stored in a dust free, dry and preferably dark environment, and well away from environmental hazards such as damp, insects or rodents.
*''Photographic (analogue) material''
Generally, photographs should be treated as specified in the section above. However since photographic images are very vulnerable to deterioration in poor storage conditions, several particular points apply:
**Prints, negatives and transparencies, including x-radiographs should be stored in acid free paper enclosures or polyester sleeves in archival boxes or dust proof cabinets.
**All films and photographs should be fully indexed and labelled with the project identifier and other appropriate information such as the film or frame number, in a manner which does not damage the image or have the potential to rub off during handling.
**Photographic material is especially sensitive to light damage, which causes fading, and it keeps better in a cold environment. Photographic material should be stored in boxes or cabinets in a dark, cool, dust free environment and well away from any potential environmental hazards.
!4.5. Long term curation of the material archive