| http://www.w3.org/ns/prov#value | - as a function of the analyte that is to be picked up, this list not being limiting. [0057] The analyte whose presence on the surface of the skin is to be revealed can be, for example, an ion, in particular a carbonate, bicarbonate, calcium, or chlorine ion. [0058] A strip 30 may include a plur
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