Public murals are one of the most visible art forms in the USA, but their extreme visibility is the cause of their greatest vulnerability. The protective coatings play an important role in preservation by providing a barrier between the surface and the environment. Current techniques can analyze only the external surface. A recent development at the Applied Research & Photonics (ARP) enables non-invasive depth profiling of permeating coatings via Terahertz scanning reflectometry. The use of terahertz spectroscopy during this investigation is the first of its kind in public art conservation. Protective coatings on mural paints were artificially aged and monitored at pre-determined intervals. Coatings on Philadelphia murals were also monitored. Targeted studies identified naturally-segregated mural materials (pigment, additives, and surfactant) and profiled layers to determine bulk and surface chemistry. This will enable an improved fundamental understanding of the composition and aging characteristics of modern artists' acrylic paints and protective coatings.

Conservation science and the preservation of outdoor public murals: A multi-analytical investigation via terahertz reflectometry

244th National Meeting (2012)

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