Fig. 10
From: Microstructure and long-term corrosion of archaeological iron alloy artefacts
a, b Raman spectra of the black boundaries (sites 2 in Fig. 9a–d). c, d Raman spectra of the white boundaries (sites 1 in Fig. 9a–d). G: goethite, H: hematite, Mh: maghemite, S: siderite, L: lepidocrocite, Gr: graphite, A: amorphous carbon (black line and points = experimental spectrum; dark blue, light blue, dark green, light green, red and purple lines = models spectrum)