Drawings from the British museum were studies using NIR spectroscopy. Based on the average uncertainty of the estimated remaining useful life, a klasification was proposed, which may contribute to preservation of drawings in museums, libraries and archives. The study was done in cooperation with University College London, Centre for Sustainable Heritage.
COBISS.SI-ID: 33743365
The development of prediction models for characterization and dating of parchment using NIR spectroscopy i pesented. Shrinkage temperature of collagen fibers is the most common method for determining the condition of parchment. By using PLS calibration and NIR spectra a nondestructive model for predicting temperature shrinkage of samples ofparchment was obtained, with the uncertainty of prediction up to 7 °C (RMSEV). In the case of dating of samples by NIR spectroscopy, the average error is 72 years (RMSEV).
COBISS.SI-ID: 34838533
The use of size exclusion chromatography (SEC) of cellulose containing iron gall ink, derivatised using phenyl isocyanate is described. A linear correlation is observed between the weight-average degree of polymerisation obtained with SEC and the one obtained using viscometry, with the slope of 1.4. The methodology was used to evaluate the extent of stabilisation of historic documents containing iron gall inks during accelerated degradation. Despite a considerable uncertainty, also caused by the heterogeneity of historic materials, it is demonstrated that efficient stabilisation by factors of 10 and 20 times is achievable using a calcium phytate treatment.
COBISS.SI-ID: 36309253