Optical characterization under a microscope of oil painting films with drying pigments: cobalt blue

Authors

  • Aranzazu Llácer Peiró Universitat Politècnica de València
  • M. Antonia Zalbidea-Muñoz
  • Miguel Angel Herrero-Cortell
  • Laura Fuster-López

DOI:

https://doi.org/10.23738/CCSJ.160207

Keywords:

drying pigments, cobalt blue, surface microscopy, artificial aging

Abstract

Traditionally in oil painting techniques, certain additives have been commonly used to enhance and adjust both their rheological characteristics and properties. Alongside the main ingredients of oil paint, such as pigments and oils, additives have also been used. Among them, drying agents, primarily composed of metallic salts like lead, zinc, cobalt, manganese, copper, or iron, play a crucial role in accelerating the drying process of the paint.

This work deals with the study of oil paint films made with cobalt blue pigment. The main purpose is to observe and characterize this pigment using various non-invasive techniques. Specifically, it focuses on the microscopic observation of samples made with cobalt blue to detect possible changes in the morphology of different pigments caused by accelerated aging. The paper aims to complement  a previous characterization of these samples, carried out through colorimetry, the results of which were presented at the XVIII Conferenza del Colore in Lecco, 2023 (Llácer Peiró et al., 2023).

Author Biographies

  • M. Antonia Zalbidea-Muñoz

    Professor in the Department of Conservation and Restoration of Cultural Heritage at the UPV, field in which she holds a doctorate degree. She has directed her research on the procedural, material and conservative aspects of mural painting, as well as parts related to varnishes and dyes in painting. At present she is also a collaborator in the work team of the project: Byzantine illuminated manuscripts in Spain: work, context and materiality - MABILUS (MICINN-PID2020-120067GB-I00).

  • Miguel Angel Herrero-Cortell

    He holds a PhD in Art History. He has a degree in Fine Arts from the Polytechnic University of Valencia (UPV) and a degree in Art History from the University of Valencia (UV). He holds a Master’s Degree in Conservation and Restoration of Cultural Heritage and a Master’s Degree in Artistic Production. He has developed his work as a researcher focusing on the field of materials and painting techniques, as well as on painting diagnosis. He is currently teaching at the Universitat Politécnica de València

  • Laura Fuster-López

    Professor at the Conservation Department in the Universitat Politècnica de València (Spain). After several research fellowships at Europe and the United States, she got her PhD in Conservation from UPV where she coordinates the area on the study of the mechanical and dimensional properties of cultural materials since 2007. She has been involved in numerous international R+D projects always with a special focus on understanding the mechanisms involved in paintings behavior and degradation.

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Published

2024-12-05

Issue

Section

Color Dynamics in Cultural Heritage

How to Cite

“Optical characterization under a microscope of oil painting films with drying pigments: cobalt blue” (2024) Cultura e Scienza del Colore - Color Culture and Science, 16(02), pp. 65–75. doi:10.23738/CCSJ.160207.