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(a) Plot of the measured t90 values for response (solid line) and recovery (broken line) times for a PR ink film when exposed to an alternating atmosphere of 0 and 5% CO2, as a function of indicator film temperature; % CO2 vs time real breath profiles recorded using (b) the PR ink film and (c) a commercial capnometer. [PR/EC/TOAH/TBP films; T = 20 °C; f = 100 cm3/min, RH = 0%.] Adapted with permission from ref (30). Copyright 1997 Elsevier.
