> I may have been unclear. The sofnolime upstream of the disk will have > the purple indicator. Virtually none of the sofnolime after the disk will > have the purple indicator. I understood that part, I was just thinking that if the "threshold" point of pH or whatever it is that triggers the indicator is relatively sharp0 and not *directly* associated with bound CO2, then it might be the case that the line between colored and uncolored absorbent is just the point where that threshold is. In other words, there may still be a cline in binding potential of the absorbent, with some of the purple stuff capbable of binding CO2, and some of the non-purple stuff already bound to CO2 (but not enough to push it over the threshold of the indicator). Rich
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