Revealing time's secrets at the National Theatre of Costa Rica: innovative software for cultural heritage research
M.D. Barrantes-Madrigal, T. Z\'u\~niga-Salas, R.E. Arce-Tucker, A., Chavarr\'ia-Sibaja, J. S\'anchez-Sol\'is, J. Mena-Vega, K. Acu\~na-Uma\~na,, M. G\'omez-Tencio, K. Wang-Qiu, F. Lizano--Fallas, C. Mar\'in-Cruz, O.A., Herrera-Sancho

TL;DR
This paper introduces innovative multispectral imaging software tools for non-invasive analysis of large-format paintings, enabling detailed study of materials, artist's techniques, and conservation status, exemplified by Italian artworks in Costa Rica.
Contribution
The development of two novel software tools, RegionOfInterest and CrystalDistribution, advances non-invasive analysis of cultural heritage paintings, facilitating detailed material and conservation studies.
Findings
Identified the artist's main color palette including zinc white, lead white, and others.
Mapped pigment crystal sizes to distinguish natural from artificial pigments.
Confirmed paint stratigraphy using microscopy and spectroscopy.
Abstract
Establishing affordable, efficient, accessible, innovative, and multidisciplinary methodologies are key to the creation of modern public policies on cultural heritage. Limited access to large-format paintings is a challenge to restoration scientists seeking to obtain information quickly, in a non-invasive manner, and identify regions of interest. Therefore, we put forward two unique software tools based on multispectral imaging techniques, with the long-term aim of assessing the artist's intentions, creative process, and color palette. This development paves the way for a comprehensive and multidisciplinary understanding of the mysteries encompassed in each pictorial layer, through the study of their physical and chemical characteristics. We conducted the first-ever study on Musas I and II, two large-format paintings by Italian artist Carlo Ferrario, located in the National Theatre of…
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