Response to Purple/blue on my negatives

Charlie wrote: "Kodak's data sheet suggests if there is a magenta cast to the negatives.....".
If there's a magenta cast? IF? I haven't developed a single roll of Tmax that DIDN'T have a magenta cast yet. It doesn't matter how fresh the fixer is, or how long it's fixed for. The only thing that gets rid of it for me is a Sulphite HCA bath.
I'm drawn to the conclusion that tap water quality has a lot to do with whether this stain gets washed away, or not. We have the peculiar combination of very soft water with a high alkalinity (pH 8.5) here, and I'm sure that's why I can't get rid of the magenta dye. Whether it's a sensitizing dye, or an antihalation layer might be a matter of debate, but the fact that it's a PITA is a certainty.

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