Transmitted light imaging in VIS and IR, in the study of paintings: a brief report on the behavior of the main historical pigments
The aim of this paper is to evaluate the behavior of 50 historical pigments in the two spectrum ranges VIS and IR, by using transmitted light. For this study, pigments were bound with oil and were applied in several layers over underlying lines, drawn with different media. The purpose of this study was to evaluate the behavior of pigments in the two spectrum ranges, comparing visible and infrared photographs with the respective images taken with transmitted light. The main idea is to compare the optical properties of each pigment in visible (VIS), transmitted light (TL), infrared (IR) and infrared transmitted (IRT). This was achieved by assessing visible and infrared photographs in incident and in transmitted light. The ultimate goal is to understand aspects such as transparency and opacity as well as the ability to block light. Finally, the intention is to classify the pigments by their behavior noting their similarities and differences, considering the aforementioned factors. Since photographic techniques are very common in the study of painting, this study has been considered useful to classify patterns of behavior, which will allow greater systematization of these types of imaging.
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