I've been everywhere ooooohhh yeaahhhh still I'm standing tall.
Is OF 1 used undiluted or diluted? If so what dilution?
"He took to writing poetry and visiting the elves: and though many shook their heads and touched their foreheads and said 'Poor old Baggins!' and though few believed any of his tales, he remained very happy till the end of his days, and those were extraordinarily long "- JRR Tolkien, ' The Hobbit '.
First of all - most developers are staining to some degree. Large sulfite concentrations tend to diminish the strain, as do acid baths. Hydrochinon is very similar to pyrocatechin chemically speaking, and also gives a good stain under the right circumstances.
The pink dye of some films washes out faster in alkaline solution, I don't think it has anything to do with alkalinity.
I use my fixer (OF-1) undiluted, but have tried it diluted 1:1 just to get more volume. Works just as well, but a bit slower.
The bicarbonate can be replaced with metaborate. I used bicarbonate since I wanted as much as possible to be available off the supermarket shelves. The pH will be similar; about 8.5 which is what I wanted: alkaline enough to get the benefits of that, while being low enough to stop most developers.