I believe tht the absorption problem also exists with E6 because the last E6 kit I used printed a warning in the instruction leaflet. The way to neutralise items afterwards is to fill them with water to which you add about a spoonful of household bleach. I do this when mixing RA4 developer.
However if you have enough measures, then save one for each of the developing stages, I doubt if it is a problem with the bleach, fix and rinse stages
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