Fig. 4: MA-XRF results.

a Visible image and corresponding elemental distribution maps for b lead (Pb-L), c tin (Sn-L), d arsenic (As-K), e iron (Fe-K), f mercury (Hg-L), g potassium (K-K), h calcium (Ca-K), i cobalt (Co-K), j nickel (Ni-K), k bismuth (Bi-L), and l copper (Cu-K).