This review is to be considered part of the development of the MEMORI dosimeter, to evaluate the impact of climate (relative humidity, temperature, illumination, etc., including volatile organic compounds) on moveable objects. In the framework of the MEMORI project, Ghent University was given the task to assess pigment degradation upon acetic acid exposure, and to collect information on pigments’ stability. Moreover, to obtain a wider knowledge on the stability of common pigments, the effect of a variety of parameters was reviewed from literature. Discolouration and degradation of pigments significantly alter the legibility of polychrome works of art, so that the development of monitoring methods to ensure the preservation of cultural heritage objects is of primary importance.

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On the stability of mediaeval inorganic pigments: a literature review of the effect of climate, material selection, biological activity, analysis and conservation treatments

Laser irradiation may alter the colour of certain pigments used in artwork. Owing to the increasing use of lasers in artwork conservation this problem becomes extremely crucial, especially in the c...

Discoloration of Pigments Induced by Laser Irradiation

This paper reviews treatment practices, historical and contemporary, for the conversion of darkened lead white, as informed by accounts in artists' treatises, early paint chemistry manuals and the conservation literature. The evolution of treatment methodology is examined with respect to changing views, conservation ethics, and the impact of various treatment methods on paper artifacts. A discussion of related scientific findings illustrates the recent advances in the understanding of factors contributing to the deterioration of lead white pigment and supports the critical evaluation of conversion treatment methods.

A review of the phenomenon of lead white darkening and its conversion treatment

Trabajo presentado al: "7th International Congress on the
Application of Raman Spectroscopy in Art and Archaeology" celebrado en 
Ljubljana (Slovenia) del 2 al 6 de septiembre de 2013.-- et al.

Raman microspectroscopic analysis of pigments of the Gothic wall painting from the Dominican Monastery in Ptuj (Slovenia)

Darkening of lead- and iron-based pigments on late Gothic Italian wall paintings: Energy dispersive X-ray fluorescence, μ-Raman, and powder X-ray diffraction analyses for diagnosis: Presence of β-PbO 2 (plattnerite) and α-PbO 2 (scrutinyite)

Techniques of mural painting in middle and northern Europe differ from those of the classic type of Italian fresco. After a brief comparison of documentary evidence with actual alterations in colou...

M. Koller

Papers

Reconversion of altered lead pigments in alpine mural paintings