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Title: Dose-response modelling for degradation of historical paper containing iron gall ink
Author: Liu, Yun
Awarding Body: UCL (University College London)
Current Institution: University College London (University of London)
Date of Award: 2019
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To advance the development of tailored strategies for collection management in museums and archives, this research is grounded in integrated modelling for decision support, in which the knowledge of material behaviours and decision-making is combined. To gain insights into the development of the backbone of integrated models, this research explores dose-response modelling for the degradation of paper containing iron gall ink. Using historical samples, three experiments were designed to investigate the two degradation processes: the ink corrosion of paper and the discolouration of ink and paper. For ink corrosion, the accelerating effect of ink on the reduction of degree of polymerisation (DP) of paper was validated with natural degradation. Firstly, the use of near infrared spectroscopy coupled with multivariate analysis to predict DP was investigated as a non-destructive method for data acquisition. Due to the difficulty in establishing successful models for the DP of ink line, the second experiment was carried out, where data of age, DP, pH, and paper thickness were collected conventionally. The presence of ink was found to increase the degradation of paper by 55% - 95% in a natural environment, complying with the results obtained from accelerated degradation. For the discolouration of ink and paper, a 23 full factorial experiment was designed to investigate the effects of [O2], relative humidity (RH) and illuminance on spectroscopic and tristimulus colourimetric responses. The photodegradation of paper was found to be affected by the main effects, whereas [O2], RH, and their interaction were found to play significant roles in the photodegradation of ink. The presence of O2 was observed to decrease the lifetime expectancy of paper by 10 times but increase that of ink by 20 times. This divergent effect of O2 required careful analysis of the contrast between paper and ink to assess the preservation risks of the entire objects.
Supervisor: Strlic, M. Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available