Figure 2

XEOM Cu-K edge data from a nantokite coated mesh on a cuprite coated coupon. (a) Post edge image from a stack acquired through a blue fluorescence line filter (a similar image is seen through green and UV filters). The emission from the mesh bars (nantokite) is lower at short wavelengths that that from the holes through which the coupon is visible (cuprite). (b) Image from a stack using a red fluorescence line filter. The emission from the mesh is now stronger than that from the coupon. (c) XEOL-XANES data from RoIs in the holes in the blue image stack (blue curve) and from the bars of the red image stack (red curve). The spectra are characteristic, respectively, of cuprite and nantokite. Note the edge shift to higher energy between the Cu(I) and Cu(II) states.^.