Fig. 6: Raman spectrum of the samples.
A Orange area in C3 (goethite), B reddish-brown area in C4 (lepidocrocite), C yellowish-brown area in C1 (akaganeite), D black area in C2 (magnetite), E red and orange area in C2 (hematite and goethite).
Fig. 6: Raman spectrum of the samples. | npj Heritage Science
