I'd like to use Formulary's TF4 alkaline fix in an old Phototherm Sidecick to develop FP4+ 4x5 sheets. The Sidekick is set to fix the film for seven minutes. Given the constant agitation that the machine this will probably be about twice the time that's recommended. Now, I know their are dangers inherent to overfixing with a acid fix, but I wonder what risk I take by overfixing with an alkaline fix. Does anyone have any experience with this?
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