title: Authenticity screening of stained glass windows using optical spectroscopy.
abstract: Civilized societies should safeguard their heritage as it plays an important role in community building. Moreover, past technologies often inspire new technology. Authenticity is besides conservation and restoration a key aspect in preserving our past, for example in museums when exposing showpieces. The classification of being authentic relies on an interdisciplinary approach integrating art historical and archaeological research complemented with applied research. In recent decades analytical dating tools are based on determining the raw materials used. However, the traditional applied non-portable, chemical techniques are destructive and time-consuming. Since museums oftentimes only consent to research actions which are completely non-destructive, optical spectroscopy might offer a solution. As a case-study we apply this technique on two stained glass panels for which the 14thcentury dating is nowadays questioned. With this research we were able to identify how simultaneous mapping of spectral signatures measured with a low cost optical spectrum analyser unveils information regarding the production period. The significance of this research extends beyond the re-dating of these panels to the 19thcentury as it provides an instant tool enabling immediate answering authenticity questions during the conservation process of stained glass, thereby providing the necessary data for solving deontological questions about heritage preservation.
authors.affiliation: Vrije Universiteit Brussel, Applied Physics and Photonics Department, Brussels Photonics Team B-PHOT, Brussels, 1050, Belgium.
authors.forename: Wendy
authors.initials: W
authors.lastname: Meulebroeck
authors.affiliation: Vrije Universiteit Brussel, Applied Physics and Photonics Department, Brussels Photonics Team B-PHOT, Brussels, 1050, Belgium.|Vrije Universiteit Brussel, Department of Art Studies and Archaeology, Brussels, 1050, Belgium.
authors.forename: Hilde
authors.initials: H
authors.lastname: Wouters
authors.affiliation: Vrije Universiteit Brussel, Department of Art Studies and Archaeology, Brussels, 1050, Belgium.
authors.forename: Karin
authors.initials: K
authors.lastname: Nys
authors.affiliation: Vrije Universiteit Brussel, Applied Physics and Photonics Department, Brussels Photonics Team B-PHOT, Brussels, 1050, Belgium.
authors.forename: Hugo
authors.initials: H
authors.lastname: Thienpont