Response to pH of TF-4, an alkaline fixer

In the second edition of The Darkroom Cookbook, Anchell lists the pH of alkaline fixers as between 8.5 and 9.5 on page 44 (under pH scale). He notes in the preface that one purpose of the second edition was to correct a number of minor errors in the first edition. Perhaps this was one.

I have made TF-3, from the second edition. It uses sodium metaborate as a buffer and has an ammonia smell. TF-4 reportedly has a "secret ingredient" which gives it twice the fixing capacity of TF-3 and less smell.

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