Abstract
In situ, non-invasive and non-destructive analysis of important artworks and cultural pieces is largely important in art conservation science. Terahertz time-domain spectroscopy and imaging delivers these requirements but lacks a materials database with fundamental understanding of salient pigments, binders and substrates. In this study, the most important synthetic pigments, the copper phthalocyanines, are investigated through terahertz time-domain spectroscopy. The terahertz spectrum reveals a series of characteristic modes in a 0.1–3-THz range across 14 pigment samples. Identification and distinction of copper phthalocyanines’ α, β and 𝜖 crystal polymorphs is demonstrated. This uniqueness within the terahertz regime is extended to two halogenated variants and a metal-free form. This invites the use of THz spectroscopy in investigation of contemporary artworks, post 1935, containing these pigments and promotes applications such as identifying fraudulent works of art.
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22 September 2022
A Correction to this paper has been published: https://doi.org/10.1007/s10762-021-00782-x
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Acknowledgements
We would like to acknowledge Saroj Bhattacharyya and the University of New South Wales for assistance in acquiring PXRD of the pigment samples.
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Squires, A.D., Lewis, R.A. Terahertz Analysis of Phthalocyanine Pigments. J Infrared Milli Terahz Waves 40, 738–751 (2019). https://doi.org/10.1007/s10762-019-00599-9
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DOI: https://doi.org/10.1007/s10762-019-00599-9