Quote Originally Posted by Kirk Keyes View Post
Agfa used to recommend a carbonate solution as a wash aid in the 70s. I think the idea was that increasing the pH of the emulsion would cuase the emulsion to swell, allowing the fixer to wash out faster.
Interesting. I found this comparison of chemicals used as wash aid:

Solution........................pH at M/250...............Effectiveness relative
.................................................. ....................to pure water

Demineralized water...............~6............................ ...1.0
Sodium chloride.....................6.1.................. ........ .....1.5
Sodium bisulfite.....................4.1................. ..............2.8
Sodium sulfate.......................6.4................. ..............14
Sodium bicarbonate................8.4.................... ............49
Sodium sulfite........................9.2................ ....... ........87
Sodium hydroxide...................11.6.................. ............89

I don't remember where I dug it up, but your information seems like it fits.

C