Predicting The Fading of Objects: Identification of Fugitive Colorants Through Direct Nondestructive Lightfastness Measurements

Whitmore, Paul M.; Pan, Xun; Bailie, Catherine

doi:10.1179/019713699806113420

Cited by 49 publications

(11 citation statements)

References 5 publications

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“…MFT time-series of observations represent potential spectral response changes [6,11,13,30]. MFT setup is highly sensitive to variations in movement, surface, and, last but not least, lighting conditions, so observations reflect usually large fluctuations and noise.…”

Section: Mft Displaymentioning

confidence: 99%

Color degradation mapping of rock art paintings using microfading spectrometry

Carrión-Ruiz

Riutort-Mayol

Molada-Tebar

et al. 2021

Journal of Cultural Heritage

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Section: Mft Displaymentioning

confidence: 99%

Color degradation mapping of rock art paintings using microfading spectrometry

Carrión-Ruiz

Riutort-Mayol

Molada-Tebar

et al. 2021

Journal of Cultural Heritage

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“…Microfade testing allows for real-time monitoring of spectral changes of a small area (diameter of 0.5 mm) of a cultural heritage object by exposing it to light. This method was developed by Whitmore and others [14,15] and has been extensively used to study the lightfastness of cultural objects [40][41][42]. In this practical case, we sought to evaluate and document the degree of color fading over time and space on rock art paintings located in Cova Remigia rock-shelter (in Ares del Maestrat, Castellón, Spain) caused by direct solar irradiation.…”

Section: Case Study and Data Descriptionmentioning

confidence: 99%

“…Microfading spectrometry (MFS) is a method for assessing the stability to light irradiation of cultural heritage objects. This method allows for real-time monitoring of spectral changes of a cultural heritage object by undertaking in situ lightfastness measurements on the surface under study [14,15]. MFS provides for each measured point on the surface of a rock art painting a time series of observations that represents potential color fading over time given exposure to light [16].…”

Section: Introductionmentioning

confidence: 99%

Correlated Functional Models with Derivative Information for Modeling Microfading Spectrometry Data on Rock Art Paintings

et al. 2020

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Rock art paintings present high sensitivity to light, and an exhaustive evaluation of the potential color degradation effects is essential for further conservation and preservation actions on these rock art systems. Microfading spectrometry (MFS) is a technique that provides time series of stochastic observations that represent color fading over time at the measured points on the surface under study. In this work, a reliable and robust modeling framework for a short and greatly fluctuating observation dataset collected over the surfaces of rock art paintings located on the walls of Cova Remigia in Ares del Maestrat, Castellón, Spain, is presented. The model is based on a spatially correlated spline-based time series model that takes into account prior information in the form of model derivatives to guarantee monotonicity and long-term saturation for predictions of new color fading estimates at unobserved locations on the surface. The correlation among the (spatially located) time series is modeled by defining Gaussian process (GP) priors over the spline coefficients across time series. The goal is to obtain a complete spatio-temporal mapping of color fading estimates for the study area, which results in very important and useful information that will potentially serve to create better policies and guidelines for heritage preservation and sustainable rock art cultural tourism.

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“…To study photodegradation, several methods exist. ,− The simplest method is to illuminate a solution of a single dissolved compounds with a lamp. Unfortunately, degradation studies often report exclusively on the degradation of the starting compound, rather than studying the pathways and concentrations of all different degradation products. , Introducing more compounds and parameters inevitably leads to a tangle of different degradation pathways that occur simultaneously.…”

Section: Introductionmentioning

confidence: 99%

Combining Photodegradation in a Liquid-Core-Waveguide Cell with Multiple-Heart-Cut Two-Dimensional Liquid Chromatography

et al. 2022

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Photodegradation greatly affects everyday life. It poses challenges when food deteriorates or when objects of cultural heritage fade, but it can also create opportunities applied in advanced oxidation processes in water purification. Studying photodegradation, however, can be difficult because of the time needed for degradation, the inaccessibility of pure compounds, and the need to handle samples manually. A novel light-exposure cell, based on liquid-core-waveguide (LCW) technology, was embedded in a multiple-heart-cut two-dimensional liquid chromatography system by coupling the LCW cell to the multiple-heart-cut valve. The sample was flushed from the heart-cut loops into the cell by an isocratic pump. Samples were then irradiated using different time intervals and subsequently transferred by the same isocratic pump to a second-dimension sample loop. The mixture containing the transformation products was then subjected to the second-dimension separation. In the current setup, about 30–40% of the selected fraction was transferred. Multiple degradation products could be monitored. Degradation was found to be faster when a smaller sample amount was introduced (0.3 μg as compared to 1.5 μg). The system was tested with three applications, that is, fuchsin, a 19th-century synthetic organic colorant, annatto, a lipophilic food dye, and vitamin B complex.

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Predicting The Fading of Objects: Identification of Fugitive Colorants Through Direct Nondestructive Lightfastness Measurements

Cited by 49 publications

References 5 publications

Color degradation mapping of rock art paintings using microfading spectrometry

Color degradation mapping of rock art paintings using microfading spectrometry

Correlated Functional Models with Derivative Information for Modeling Microfading Spectrometry Data on Rock Art Paintings

Combining Photodegradation in a Liquid-Core-Waveguide Cell with Multiple-Heart-Cut Two-Dimensional Liquid Chromatography

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