The results from the second experiment including the OCP measurements and the Ni concentrations calculated from XANES measurements are presented in Fig. . The concentration of corroded Ni within the salt still did not follow a clear trend, but rather, peaked in certain regions and then decreased again. The XANES spectra in this experiment, similar to the previous, detected the presence of Ni 2+ and metallic Ni (see Fig. ). The metallic Ni XANES spectra were obvious at the locations of the peaks (2 and 3 hours) in Fig. . This behavior is suggestive that the extreme environment caused small pieces/grains of the foil to be liberated from the foil, and subsequently move throughout the melt. This is potentially related to the grain boundary attack described by Olson et al. . The concentration of Ni 2+ also spiked in unison with the metallic Ni peaks suggesting that the metallic Ni pieces carry large Ni 2+ concentration gradients with them.