Fig. 2From: An enhanced procedure for the analysis of organic binders in Pompeian’s wall paintings from Insula OccidentalisRepresentative FT-IR spectra of paint powder layer and underlying calcite layer. Spectra of sample S3 (upper panel) and corresponding calcite layer (lower panel) collected from a 30 μg spot. The area of the calcite peak at 2510 cm−1 (2400–2700 cm−1) was used for sample components quantitation. Inset, calcium carbonate FT-IR spectra frequenciesBack to article page