Fig. 1From: Infrared spectroscopy reveals the reactivity of fatty acids on copper surfaces and its implications for cultural heritage objectsConsecutive spectra of caproic acid (C6) after deposition on copper-zinc alloy surface a full spectra; b zooming in the region 1800–1350 cm−1 from the same spectra. Ambient temperature was recorded at 23 °C and RH at 37%; time is given in hours:minutesBack to article page