I sometimes have a similar problem when my wash water is too cold. I use a fix tester frequently to make sure my fix is still good. Even if it stll tests good I discard it after using three TMax-RS 757ml size containers of developer or after three months, whichever is sooner. I use the developer 1 shot style at 1:9. About 1 out of 50 rolls or 1 out of 50 sheets of large format will still exhibit some residual stain for me.
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