Figure 2.

(a) A picture of the experimental setup used for stretching test (top) and of the TTE transferred onto a conductive and stretchable rubber substrate (bottom). (b) Representative example of short term stretching test. (c) Representative example of long term stretching test. (d) An example of the impedance signal during 2 min of “shaking”, showing that the sensor output is scarcely affected by motion artifacts. (e) Summary of the results of long term stretching test. (f) Summary of the results of long term stretching showing that stretching lifetime of the tattoo is not significantly deteriorated with aging.