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Characterization of tattoo electrodes electrical interfacing with skin: impedance across couple electrodes. A) Schematic of the three electrode types: Ag/AgCl, tattoo, and metal. B) Picture of the three pairs of electrodes on the forearm. C) Short‐term test: evolution of the median impedances (n = 7) at representative frequencies over 1 h. D) Long‐term test: evolution of the Ag/AgCl and tattoo impedance (n = 1) at representative frequencies over 48 h.
