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Comparative assessment of two portable Raman spectrometers for the characterisation of historical natural dye lakes by Silvia Bottura‐Scardina; Peter Vandenabeele; Catarina Miguel; António Candeias is a Chemistry article available to read on EtoBox.

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This paper explores the use of portable Raman instruments to characterise natural dye lakes in paint mixtures, as an alternative approach to other Raman techniques (e.g. SERS). Raman spectroscopy has indeed been used extensively to study natural dyes as pure substances or as artistic pigments (dye lakes). However, the examination of these compounds with Raman spectroscopy is particularly challenging because of a strong fluorescence, a relatively weak Raman signal and their occurrence at low concentrations in artefacts. Because of these challenges, the typical way of analysing these materials is through either surface-enhanced Raman spectroscopy (SERS) or Fourier-transform (FT) Raman spectroscopy, yet those approaches are not always desirable in art analysis, especially as they often require micro-sampling. Therefore, this study explores the potential of using commercial mobile instruments, which would open the possibilities for direct in situ analysis. Two dispersive instruments, one using a fibre-optic probe and a 1064-nm excitation laser and the other using the subtracted-shifted excitation (SSE) post-processing algorithm, have been tested in their feasibility to characterise dye

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Author

Silvia Bottura‐Scardina; Peter Vandenabeele; Catarina Miguel; António Candeias

Publisher

Wiley

Published

2023

Language

EN

Field

Chemistry (Physical Sciences)