Non-invasive characterization of the painting Saint John the Evangelist by means spectroscopic methods

Francis Anna Cardoso Reis de Almeida Sanches; Raysa Costa Nardes; Ramon Silva dos Santos; Carlos Eduardo Lima Netto; Renato Pereira de Freitas; Davi Ferreira de Oliveira; Ricardo Tadeu Lopes; Catarine Canellas Gondim Leitão; Marcelino José dos Anjos

doi:10.15392/2319-0612.2022.1964

Autores/as

Francis Anna Cardoso Reis de Almeida Sanches Universidade do Estado do Rio de Janeiro
Raysa Costa Nardes Universidade do Estado do Rio de Janeiro
Ramon Silva dos Santos Universidade do Estado do Rio de Janeiro
Carlos Eduardo Lima Netto Universidade do Estado do Rio de Janeiro
Renato Pereira de Freitas Instituto Federal do Rio de Janeiro ,
Davi Ferreira de Oliveira Universidade Federal do Rio de Janeiro
Ricardo Tadeu Lopes Universidade Federal do Rio de Janeiro
Catarine Canellas Gondim Leitão Universidade do Estado do Rio de Janeiro
Marcelino José dos Anjos Universidade do Estado do Rio de Janeiro

DOI:

https://doi.org/10.15392/2319-0612.2022.1964

Palabras clave:

Archaeometry, 19th century, pigments, Raman spectroscopy, XRF, Computed radiography

Resumen

In this work, the pigments and ground layers of the Saint John the Evangelist painting were analyzed using the techniques of computed radiography, X-ray fluorescence (XRF), and micro-Raman spectroscopy. The painting was purchased by a collector at auction as a 19th-century work of art of unknown authorship. XRF analyzes were performed with a voltage of 40 kV, current of 50 µA, and acquisition time of 60 s. Micro-Raman spectroscopy measurements of a black fragment sample were performed with the Thermo Scientific – DXR2 Raman microscope equipment. The sample was excited by the adjusted 785 nm laser source with a power of 4 mW, focused on the sample using a 100x objective. It was possible to characterize the pigments used in the painting of São João Evangelista as Lead White, Vermilion, Carbon Black, and Ocher. No areas of repainting and modern pigments were identified that could suggest any type of intervention.

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