Chemistry

Direct evidence for metallic mercury causing photo-induced darkening of red cinnabar tempera paints

K. Elert, M. P. Mendoza, et al.

Discover the intriguing mechanisms behind the photo-induced darkening of red cinnabar tempera paints, revealing how oxidation and reduction processes shape visual perception in artwork. This innovative research by Kerstin Elert, Manuel Pérez Mendoza, and Carolina Cardell offers fresh insights into pigment chemistry and binder interactions, showcasing real evidence of mercury formation.

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Playback language: English

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Abstract

Photo-induced darkening of red cinnabar (HgS) tempera paints, impacting artwork visual perception, is studied. This study proposes an alternative pathway for cinnabar blackening, considering its semiconductor properties and pigment-binder interactions. It demonstrates darkening is caused by cinnabar oxidation to mercury sulfates and subsequent reduction to Hg0 via photo-induced electron transfer, without chloride involvement. Direct evidence of Hg0 on UV-aged tempera paint is provided. Photooxidation affects the organic binder, limiting mercury sulfate formation but not impeding Hg0 reduction. Organics provide Hg0 sorption sites, causing darkening.

Publisher

Communications Chemistry

Published On

Dec 10, 2021

Authors

Kerstin Elert, Manuel Pérez Mendoza, Carolina Cardell

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