Banding on MF B/W negative

[Pieter12]

My point was that the OP was doing some kind of rotary agitation, but not backwards and forwards. I think it’s likely that unidirectional spin caused his problem - nothing to do with air bubbles.

As for air bubble precautions, one can certainly miss out the twiddle stick, but I find it quicker to use it in those critical first few moments than to get the lid on securely and invert the tank. Each to their own.

I haven’t tried any daylight processes on film for a long, long time, but I do remember using a spiral in a glass beaker (so as to monitor the process) and being impressed by the air bubbles, which had previously been theoretical only.

How could you see the bubbles? Ortho film?

 

[snusmumriken]

How could you see the bubbles? Ortho film?

Not that clever! Just little bubbles stuck on the visible outer surface of the film and on the inside of the beaker. I remember being impressed by how long they clung on despite the spiral being twisted and plunged up and down.

 

[Pieter12]

Not that clever! Just little bubbles stuck on the visible outer surface of the film and on the inside of the beaker. I remember being impressed by how long they clung on despite the spiral being twisted and plunged up and down.

In the dark?

 

[snusmumriken]

In the dark?

No, no, sorry, I misunderstood your question because I did say daylight processes. Those were early adventures with intensifier or reducer, so the film was already developed and fixed. In those impoverished days of my youth I had a Zenit camera and no exposure meter, and my exposures were all over the place. Development too. So I tried all kinds of ways to rescue pictures that were really dustbin jobs. I have got a little wiser since.

Apologies to the OP, we have strayed off topic.

 

[hiroyuki]

Thank you. Because this document (https://35mm-compact.com/manuels/paterson-uk.htm) is typeset in the same style (headlines bold blue caps, etc...) as the rest of the 35mm-compact website, I had not registered it as being official Paterson instructions, and thought it was one of these enthusiast recipes.
That said, I won't adhere to the single inversion implied by the wording of that document. I take the advice of Doremus Scudder and juan.
I remain weary of rotation because (end of post #9 by Ian C)

(...) and if I would use the initial rotation (purpose?) as in the Paterson instructions, I would heed to your advice (your post #10)

now that I've seen the consequence of rotation freewheeling (as it were) and slowly (?) dying off until the next minute.

Do I need to repeat once more that anyone, photrio or elsewhere, is free to agitate as they please?