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Tempera portray probed on the molecular scale

Making of a egg-tempera portray recipe from the fifteenth century within the lab. Credit: Agathe Fanost/LAMS/CNRS-Sorbonne Université

In distinction to the oil portray approach that supplanted it on the finish of the fifteenth century, tempera portray, practiced on wooden panels, partitions or canvas has obtained little consideration on the physico-chemical scale. This portray approach, which has been practiced since Antiquity, is characterised by pigments utilized in a water-based binding-medium, usually egg-yolk.

In order to know the properties and enchantment of this combination on a molecular scale, a CNRS group, from Sorbonne Université and ESPCl, reproduced fifteenth century recipes {that a} Tuscan painter Cennino Cennini had consigned to paper, utilizing egg-yolk and a clay-based pigment, inexperienced earth (terra verde). This mixture was used on a big scale in works relationship from the Middle Ages, as a base-layer for gilding and the rendering of flesh.

By measuring its stream properties and characterizing its molecular group, the group has proven the formation of a community between the proteins of the egg-yolk, the water molecules and the clay particles of the pigment renders the combination extra viscoelastic. Thanks to this synergy between the yolk of egg and the pigment, the spreading and protecting properties of the paint are enhanced because of a greater inside cohesion of the pigments within the presence of the binder.

This research on the very boundary of supplies science and artwork historical past, revealed on the 24 November 2021 within the journal Angewandte Chemie, contributes to the higher understanding of the supplies chosen by painters, with the prospect of enhancing the conservation and restoration of works executed with this method.

19th century painting tricks revealed

More info:
Agathe Fanost et al, Connecting Rheological Properties and Molecular Dynamics of Egg‐Tempera Paints based mostly on Egg Yolk, Angewandte Chemie International Edition (2021). DOI: 10.1002/anie.202112108

Tempera portray probed on the molecular scale (2021, November 24)
retrieved 24 November 2021
from https://phys.org/news/2021-11-tempera-probed-molecular-scale.html

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