Visible-induced spectrofluorimetry as a non-invasive tool for the in situ identification of early synthetic dyes in cultural heritage objects dating back to the late 19th or early 20th century

In this study, the use of visible-induced emission spectroscopy with portable instrumentation was explored for the non-invasive, in-situ identification of early synthetic dyes in various objects dating from the late 19th century to the early 20th century. The spectroscopic data were analysed and compared with those of model samples using multivariate methods. Specifically, Asian textiles were examined to identify dyes, shedding light on challenges related to different production techniques or dye degradation. Additionally, the same technique was applied to study the colorants used in frames from Early Cinema films.