Identification of Paint by ER-FT-IR: Analysis of Paint Binder and Extender in Paint

Identifying the types of paints in artworks with uncertain painting materials is very important in conservation science and art history. However, it is difficult to distinguish the type of paint diluted in a solvent with the naked eye because the diluted paint lost its characteristic texture and gloss. Accordingly, an analysis method that can interpret the type of paint is being studied, and in particular, a non-destructive analysis method that can be analyzed without sampling is required. This study attempted to supplement the limitations of the existing artwork analysis method by examining the applicability of ER-FT-IR, a non-destructive and non-contact analysis method. As a result of the analysis, it was possible to distingu ish between oil paint and a crylic paint through a carbonyl band with high detection sensitivity. In the case of watercolors and gouache paints which use the same binding medium, it was possible to distinguish them by comparing the detection intensity of extender in ATR mode, but it was difficult to compare the detection intensity of extender o f the two paints as the overall detection intensity decreased in ER mode. Therefore, it is recommended that cross-analysis through microscopic observation and XRF analysis is necessary when analyzing artworks.