Long-chain mercury carboxylates relevant to saponification in oil and tempera paintings: XRPD and ssNMR complementary study of their crystal structures

Barannikov, Ruslan; Kočí, Eva; Bezdička, Petr; Kobera, Libor; Mahun, Andrii; Rohlíček, Ján; Plocek, Jiřı́; Švarcová, Silvie

doi:10.1039/d1dt04160f

Cited by 3 publications

(1 citation statement)

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“…Barannikov et al have utilized a multi-technique analysis to assess the structure and reactivity of mercury soaps to model paintings containing cinnabar (HgS). 39 In this report, we provide the first 67 Zn NMR spectra of pure zinc soaps, demonstrating that high-field 67 Zn solid-state spectroscopy of soaps is an analytical technique to quantify and follow the formation of zinc soaps in paintings. 67 Zn (I = 5/2) is a low-γ quadrupole nuclide with relatively low natural abundance (4.1%) and large quadrupolar moment (Q = 0.122 × 10 −28 m 2 ), which results in low sensitivity and broad resonances.…”

Section: Introductionmentioning

confidence: 82%

Multi-technique structural analysis of zinc carboxylates (soaps)

et al. 2023

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Section: Introductionmentioning

confidence: 82%

Multi-technique structural analysis of zinc carboxylates (soaps)

et al. 2023

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Estimation of the linseed oil content in historic lime mortar

Bauerová

Kracík-Štorkánová²,

Mácová

et al. 2022

J Therm Anal Calorim

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Non-invasive evidence of mercury soaps in painted miniatures on ivory

et al. 2023

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This work focuses on a non-invasive study of two selected painted miniature portraits on ivory to describe the degradation processes resulting from the interaction between mercury-based and lead-based pigments with oils. In the studied miniatures, containing both lead white and cinnabar, the formation of metal soaps has been clearly detected. However, until now they have been identified exclusively as lead soaps. In this study, the formation of mercury soaps has been evidenced in painted artworks for the first time, together with the well-known lead soaps. The fully non-invasive analytical approach involved the use of large-area X-ray fluorescence scanning, X-ray powder diffraction and Fourier transform infrared spectroscopy accompanied by Raman spectroscopy. It enabled complex description of the miniatures, leading to both the identification and the deduction of approximate composition of mercury soaps. In addition, approximate calculations of the amount of pigments consumed by saponification unveiled the complex processes taking place in the oil-based paint containing both cinnabar and lead white, which were further studied within long-term model experiments monitored by both Fourier transform infrared spectroscopy and X-ray powder diffraction.

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Long-chain mercury carboxylates relevant to saponification in oil and tempera paintings: XRPD and ssNMR complementary study of their crystal structures

Abstract: Saponification, resulting from pigment-binder interactions, is one of the most endangering phenomenon affecting the appearance and stability of painted works of art. The crystallization of metal carboxylates (soaps) in paint...

Cited by 3 publications

References 58 publications

Multi-technique structural analysis of zinc carboxylates (soaps)

Multi-technique structural analysis of zinc carboxylates (soaps)

Estimation of the linseed oil content in historic lime mortar

Non-invasive evidence of mercury soaps in painted miniatures on ivory

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