Fig. 3From: Distribution of nickel and chromium containing particles from tattoo needle wear in humans and its possible impact on allergic reactionsAllergic reaction to a red-brown tattoo of a patient sensitized to nickel. a Skin section nano-X-ray fluorescence (XRF) image recorded at beamline ID16B with distinct areas of iron (Fe) pigments (region 2) and smaller Fe-chromium-nickel (Fe-Cr-Ni) particles (region 1) in titanium (Ti)-rich regions. b Photography of the skin’s reaction to the tattoo before removal by dermabrasion. c Normalized XRF spectra in Fe pixels extracted from regions 1 and 2, as indicated in the Fe XRF image in (a). Abbreviations: Cu = copperBack to article page