Thank you for your advice as well.
I use Agfa Multicontrast Classic, Ilford Warm-tone Fiber and Forte VC Fiber papers.
I have been using just the one Non-hardening Rapid Fixer.... I suppose there's a more preferable alternative. When people speak of double fixing, are there two trays of the same or different solutions of fix?
I appreciate the technical description. I find it fascinating, and I need to embark on some serious research. The knowledge of how will no longer satiate my curious-want to know why.
I'm off to the Ilford site to read more.