South Korean Joint Investigation Group (JIG) [1] presented two "critical scientific evidence" that link the sinking of the South Korean navy corvette Cheonan on March 26, 2010 to the alleged explosion of a North Korean torpedo: the now-infamous "No. 1" blue ink mark on the torpedo, and the electron-dispersive spectroscopy (EDS) and x-ray data of the three "adsorbed materials" extracted from the ship, the torpedo and a small-scale test-explosion. In our previous paper [2], we described the inconsistency of JIG's EDS and x-ray diffraction (XRD) data. Here we report our SEM, EDS, and x-ray experiments on an Al powder that underwent melting followed by rapid quenching, and our simulation of the EDS spectra of Al2O3 and Al(OH)3. We obtained an experimental value of 0.25 for the EDS intensity ratio, I(O)/I(Al), and a simulation result of I(O)/I(Al) ~ 0.23 for Al2O3 formed on the surface of the adsorbed materials during an explosion. The JIG's EDS data, however, showed very different values of ~ 0.9 for the same ratio. Interestingly, the high value of ~ 0.9 is expected for "rusted" aluminum, such as Al(OH)3, that can be formed by exposing Al to moisture or water. Our results indicate that
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