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Medium- and Long-Term Drying Effects in Tempera Paint Films Explored Through NMR Relaxometry Analysis.

Floriane Gerony1,2, Maguy Jaber2, Laurence de Viguerie2

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Egg yolk tempera paint drying was studied using NMR. A significant change in paint properties occurs around 1-2 months, influenced by water content and pigment characteristics.

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aging of paintegg yolkfast‐field cycling NMR relaxometry

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Area of Science:

  • Art conservation science
  • Materials science
  • Biophysics

Background:

  • Egg yolk tempera is a historical painting medium.
  • Understanding its drying process is crucial for conservation.
  • The role of binder composition and pigments in drying is complex.

Purpose of the Study:

  • To investigate the long-term drying process of egg yolk tempera paint in the dark.
  • To analyze the influence of water content, pigments, and drying time on paint properties.
  • To characterize the structural changes within the egg yolk binder during drying.

Main Methods:

  • Nuclear Magnetic Resonance (NMR) relaxometry and spectroscopy were employed.
  • Proton (1H) signals from egg yolk fatty acids were analyzed.
  • NMR dispersion (NMRD) profiles were measured over 24 hours to 2 years.

Main Results:

  • Increased water content (>50 wt%) led to egg yolk lipoprotein destructuration.
  • Pigment characteristics (chemical nature, shape, surface area) also affected lipoprotein destructuration.
  • A distinct, discontinuous change in NMRD profiles (a step) was observed around 1-2 months of drying.

Conclusions:

  • The drying of egg yolk tempera paint involves significant structural changes over time.
  • Water content and pigment properties critically influence the drying kinetics and binder stability.
  • The observed time-dependent step change in NMRD suggests a phase transition or significant structural rearrangement within the paint film.