Acufine Diafine Divided Developer Lifespan

The internet says Diafine lasts forever. Search, it’s out there all over the place. No one talks time though. They just comment things like “It ran until I contaminated the B solution with A”, or “The volume of A got so low I just mixed up another batch”. That’s great, but I don’t want to know that. This isn’t going to be that, this is going to be dates.

My Diafine was mixed up July 2018. In the following several months I ran thirteen rolls of 120 and fifteen rolls of 135 (I know because I make hash marks on a masking-tape label on the bottle). A couple of the rolls of 135 were twenty four exposure, but the rest were all thirty six. Then, in December, some shit went down and the bottles sat on a shelf in a friends basement until, well, today. Solution A was in a white PTFE bottle and solution B was in a plastic coated amber glass bottle. That wasn’t a conscious choice beyond my wanting different bottles so I could tell them apart, and it was what I had. It also helped that solution B could go in a Brown bottle.

Just ran a roll of Arista EDU Ultra 400. Came out fine. With chemistry that was mixed up four years and nine months ago.

I can’t comment on how long it lasts in terms of rolls processed, I’m sure there are folks who have gone way over thirty rolls and I’m a roll short of that even now. I do feel it’s useful to say after almost five years, it’s still working as well as when I mixed it. Let it be said, the working shelf-life if Diafine developer is at least five years.

One tip I’d like to add though. Solution A will decrease in volume faster than solution B. This is because, in general, solution A is hitting a dry film and absorbing into the emulsion. When you pour solution A back into your stock bottle whatever absorbed into the emulsion stays behind. That can be avoided by adding a minute or two of a plain water soak at the front end of your processing. The water doesn’t noticeably affect the action of solution A and it cuts down on how much of solution A is “wasted” just wetting the emulsion.