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Simple colour-change experiments to assess a new AF-2400 gas permeable flow reactor. The reactor consists of a sealed bottle (a) Sudan red dye is bleached by ozone gas permeating into solution through the reactor tubing, which visible (b) as a colour change from red to colourless. Similarly, solvation of oxygen gas (c) is followed by the oxidation of vanadium(III), which also has a distinct colour change from purple to brown (d).
