Agitation Technique with Tanks/Hangers

[Alan9940]

Seeking advice on effective agitation technique with tanks/hangers to achieve even development in really tough areas like clear blue sky. I tried several ideas on my own, but the closet agitation technique I've settled on so far is:

1) lift left to about a 45 degree angle, hold for a few seconds, and then back into developer.
2) lift right to about 45 degree angle, hold for a few seconds, and then back into developer.
3) lift straight up, then back into developer.
4) lift about an inch, then drop to remove any air bubbles.

This is what I call one agitation cycle which takes about 15 secs to complete. When developing, I agitate for the first minute (4 agitation cycles), followed by one agitation cycle each minute thereafter.

As I said, this technique is the best I've found so far, but I can still see slight mottling in the lighter gray of clear blue, sunny southwest skies. I've read that more vigorous agitation will provide more even development, but I've tried that, too, and my experience has not been successful when doing more frequent agitation and/or more vigorous agitation.

If it makes any difference, I'm using 2L and 5L tanks (made by Vinny Walsh) with 8x10 holders or 4-up 4x5 holders.

Any advice/guidance would be very much appreciated.

[LabRat]

That is the proper method... I use it with 1.5 ltr tanks with 1 up 4X5 hangers, and it works fine... I haven't used bigger tanks with multi hangers or larger films in a long time, but it did work ok without burst processing...

Your dev dilution might be too low, so try a greater dilution, as byproducts of developed areas will be less dense, so your agitation will clear those areas better, as the "clouds" there would be slightly less dense...

Steve K

[Alan9940]

Hi Steve,

Thanks for the reply!

You could be right about the developer dilution, since I'm using Rodinal at 1:100. Any idea of what percentage to cut development time, if I try 1:50 vs 1:100?

Alan

[Leigh]

You could be right about the developer dilution, since I'm using Rodinal at 1:100.
Any idea of what percentage to cut development time, if I try 1:50 vs 1:100?

Hi Alan,

The Massive Development Chart tells you everything you want to know:
https://www.digitaltruth.com/devchar...=C&TimeUnits=D

You have to specify the film and the developer. For Rodinal, it shows all common dilutions.

To address your original question...
I use your step #4 by itself, usually with a bit of tilt. My developers are Rodinal, Acufine, and DiaFine.
I've never encountered a problem in over 60 years of doing it this way.

- Leigh

[LabRat]

You want a more dilute developer, as this will slow down the activity...

Like Leigh sez, check the chart to find a more dilute version with a longer development time you are comfortable with and try that...

Also, your moves in and out of the dev should be as smooth as possible, so don't over agitate them...

Check back with us, when you solve it...

Good luck!!!

Steve K

[Leigh]

You want a more dilute developer, as this will slow down the activity...

Steve,

He wants to reduce the development time, not extend it.

- Leigh

[LabRat]

Sorry, I thought he was concerned about the uneven development...

Steve K

[Alan9940]

@LabRat - you are correct, I am concerned with uneven development; desperately trying to arrive at a technique that works for me.

@Leigh - I am aware of the MDC and always use that as a jumping off point. Over the years, though, I've found that my own personal development times can differ quite significantly from those on the chart. Therefore, if I have a good development time for Rodinal at 1:100 that's quite different from the time listed on MDC, is there any easy way to guess what the time would be at 1:50 dilution? I doubt that it's simply half the time because the developer strength is 2x?

Regarding your agitation technique (my #4), what tanks are you using? I ask because the ones I have (made by Vinny Walsh) are pretty tight and wouldn't allow much tilt without raising the hanger quite high out of the developer. Though I've never seen an old Kodak rubber tank for 8x10, they were big enough to allow a frame basket containing holders to be dropped in together. Therefore, I'm guessing the distance from the side of the holder to the side of the tank is quite a bit more than what I have.

[Leigh]

Hi Alan,

You can use the delta between 1:50 and 1:100 times on MDC as a factor for your 1:50 v. 1:100.

My 8x10 tanks are Kodak or "other". I never paid attention. They are large enough to allow tilting.

- Leigh

[LabRat]

My tanks are a fairly tight fit with the basket, but can practice it in the light where you lift it almost all the way out, then tilt 45deg...

Allow the rack to evenly move into/out of solution, but not so fast it pumps through... Allow it to sink on its own being slightly eased down or you can get surge effects...

Steve K