Abstract
AbstractHistorical transparent glass is a fragile and challenging material. Deterioration of historical glass objects kept in presence of volatile organic compounds (VOCs) mainly formaldehyde, formic acid and acetic acid, is a known phenomenon. Similar issues were encountered with glass objects in the collection centre of the Swiss National Museum, belonging to 17th–20th century CE. Until 1999, these objects were stored in chipwood mobile shelving units (a source of VOCs) in conditions with fluctuating relative humidity (RH) levels and temperature. To study this phenomenon, model glasses were produced and subjected to accelerated aging with variable relative humidity and in the presence of acetic acid and formic acid. The aged samples were documented using digital techniques such as digital photography, reflectance transformation imaging, optical microscopy, and hyperspectral Imaging (HSI) to assess changes in their appearance and to detect early signs of corrosion. The results from the application of multi-modal imaging techniques to visualize the surface of transparent colourless glass show promise for the documentation of VOC induced corrosion phenomena on glass surfaces.KeywordsGlass corrosionArtificial agingOptical microscopyDigital photographyReflectance transformation imagingHyperspectral imaging
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