Fig. 3From: Infrared spectroscopy reveals the reactivity of fatty acids on copper surfaces and its implications for cultural heritage objectsThe region 1800–1500 cm−1 from consecutive spectra of C10 after deposition a and b on pure copper surface, and c and d on copper-zinc alloy surface; spectra on a and c correspond to clean/polished surfaces, while b and d to pre-corroded surfaces. Runs were recorded at 20 °C and RH 40%Back to article page