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A large scale 'Microclimate' enclosure for pyritic specimens

Current environmental conditions within the Palaeontological Department of The Natural History Museum are unsuitable for the safe storage of humidity sensitive, actively pyritising plant specimens. The collections cabinets, timber framed with laminated composite doors, offer a limited amount of buffering against small environmental fluctuations, but were not designed to compensate for larger humidity changes. As an alternative to purchasing a costly environmentally controlled cupboard, a department standard free standing collections cabinet was wrapped in a moisture resistant barrier film, Marvelseal� 470, to provide a large scale 'microclimate' using Art-Sorb� as an environmental control. This wrapped cabinet currently provides a favorable humidity level of approximately 45% with a range of +/- 4.5% relative humidity, compared to the general collections area of 50% with a range of +/- 16.9% during the four month trial period. The cabinet has provided space for the installation of over three hundred humidity sensitive plant specimens whilst a systematic long term conservation programme can be undertaken. In addition, it provides a suitable storage area after conservation prior to the installation of new environmental control equipment.