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I think you didn't understand what I'm trying to say. The thing is DCPIP becomes colourless but in the presence of chlorophyll shouldn't it remain green? As a result, the absorption will be at a higher level than zero. Also, the plateau reaches constant value of 0.6 au (I think) at 7.9 (or earlier) right?yes it does not finish as the absorption goes to plateau above the zero value