There's a lot of bull-shit about alkali fixers most aren't Alkaline at all, someone seems to have tried to reinvented the definitions of Acid & Alkali.

pH 7 is neutral, most Alkali fixers are pH 5.6 - 6.8 according to one online test - that's acidic

Now how can a sub pH 7 fix be alkali but that's the claims

Ian