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. 2017 May 11;89(11):6277–6284. doi: 10.1021/acs.analchem.7b01452

Figure 4.

Figure 4

Fraction of the redox couple in the reduced state as a function of the oxygen partial pressure at 1150 °C. ① Medieval furnace atmosphere.5 ② Air. Colored dots correspond to the redox estimated for the corresponding colored glass stripe. Adapted from refs (46−48).