I'm using Efke 25 film in 4x5 and 8x10 size and trying to process it without getting scratches. Many have said that it has a soft emulsion and a hardening fixer is needed. I could use regular kodak fixer or the Kodak Rapid fix that has hardener but I have two issues with that.
1) I would prefer to mix my own fixer from sodium thiosulfate because it is cheap to make and also because my darkroom sessions are sometimes spaced far enough in time that a freshly made fixer seems like a good idea vs whats been sitting in the bottle since the last time.
2) The odor of Kodak fixer is fairly strong for my darkroom that is located in my house.
So, can I just add some Kodak hardening solution to my homebrew fixer? I have some from the past when I've used the rapid fixer without the hardener plus there are hardeners that can be mixed from scratch.
Is there a less smelly hardening fix that I can mix in smaller batches?
thanks for the help.