I've updated my ongoing notes on low agitation development to reflect some testing I did with HC-110 diluted 1:128:
https://gitbucket.tundraware.com/tun...-dilute-hc-110
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I've updated my ongoing notes on low agitation development to reflect some testing I did with HC-110 diluted 1:128:
https://gitbucket.tundraware.com/tun...-dilute-hc-110
Nice write up. You mention Bromide drag a couple of times in your article. What if you used a developer without Potassium Bromide like Pyrocat-M or Obsidian Aqua? I haven't tried stand methods with either yet but they behave similarly to Pyrocat HD for EMA and Normal processing. A question for the chemists out there - would there be less bromide created if PB is omitted as a restrainer?
Quote:
Originally Posted by esearing
The bromides in question are not caused exclusively by the KBr in the developer as best as I can tell. There are reaction products from the silver bromides in the film itself released during development. For example, I've seen slight drag effects when using Pyrocat-M.
These byproducts appear to always be present in varying degrees. The remedy appears to be suspend sheet film with minimal support points and raise roll film reels above the floor of the developing tank (because the byproducts seem to sink to the bottom via gravity).
That said, there does seem to be some relationship to KBr in the developer. I found that very old Plus-X could not be reliably semistand developed in Pcat-HD no matter what I did. It worked just fine in D-23. I never tried it with Pcat-M, but I guess I should.