Prof. Maria Melo Profile

Prof. Maria Melo

at Univ Nova de Lisboa

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Proceedings Article | 20 June 2021 Presentation

Probing the degradation of cadmium yellow oil paints

Marta Ghirardello, Vanessa Otero, Gianluca Valentini, Lucia Toniolo, Austin Nevin, Maria Melo, Daniela Comelli

Proceedings Volume 11784, 117840L (2021) https://doi.org/10.1117/12.2593596

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Cadmium yellows are a class of pigments based on cadmium sulfide (CdS) that can suffer degradation [1-4]. Although the degradation mechanism has been elucidated [5], the reasons behind the higher reactivity of some CdS are still unclear. It has been hypothesized that the higher reactivity can be related to an imperfect synthesis method [2-3]. This work shows that pigments synthesized following different routes [6-7] present different degrees of degradation in paints after artificial ageing. Moreover, the development of degradation products depends on the synthesis method and the photoluminescence emission from trap states [8] can be modified following degradation. Results obtained on in-laboratory prepared paints will be compared to historical degraded CdS paints from real paintings.

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