no no, I knew about the after bath alkalinity. By double fix I meant, as per GH's suggestion, fixing TMX normally (which for me is 2 min in rapid or 3 min in F24), then using fresh fixer for 1 minute to rid the anti-halation dye.(posted 9009 days ago)and HCA...duh...right...got it. I never hypo-clear negs, just prints, because of what you noted with PMK.
But I'll start doing so with whatever developer I end up using with TMX...
thanks John. shawn