Quote Originally Posted by Gerald C Koch View Post
To provide halide solvency and replace the sodium sulfite used in conventional developers HC-110 contains the addition product of an amine and sulfur dioxide. To replace potassium bromide which is an inorganic salt and not soluble in glycols an addition product of an amine and hydrogen bromide is used. These are not chemicals that are readily available from chemical suppliers.
It might be interesting to know how something similar performs without the solvent---obviously you'd expect more grain and more acutance, which I think would be a totally acceptable tradeoff for many HC-110 users, especially in medium and large formats.

The potassium bromide replacement is the PVP, right? It seems like other antifoggants could be tried---for that matter, is it obvious that one couldn't dissolve KBr in something else like glycerin first? But one would need to do *something* for fog control, certainly.

As pointed out there is a homebrew replacement for HC-110. It is called D-76.
You clarified this below, but I still think it's an amusing way of putting it. Point taken about the development results---by design they aren't *very* different---but personally I quite like working with a concentrate that lasts forever rather than having more stock solutions to worry about.