Evaluating the influence of mixture composition on the kinetics of salt damage in wall paintings using time lapse video imaging with direct data annotation |
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| Authors: | Alison Sawdy Adrian Heritage |
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| Institution: | 1.Institute of Archaeology,University College London,London,England;2.Institut für Restaurierungs-und Konservierungswissenschaft,Fachhochschule K?ln,K?ln,Germany |
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| Abstract: | This paper presents an examination of the timescale of phase transition behaviour of a series of salts known to cause damage
to wall paintings and other cultural property. The rate of deliquescence and crystallisation of single salts (nitromagnesite
and halite) under different RH regimes, and the extent to which this was affected when mixed with other salts (niter, nitratite
and gypsum), was investigated. The study was conducted using simple conventional techniques (mass measurements over time)
and also using an innovative new method: timelapse video imaging with online data annotation. The results demonstrate the
synergy gained from combining video imaging with environmental data in reference to time in the study of salt phase changes:
where it revealed new information concerning the kinetics of deliquescence and crystallisation. The implications of these
results for the implementation of environmental control measures within historic buildings are discussed.
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| Keywords: | Salt damage Wall paintings Kinetics Timelapse video imaging Environmental control |
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