Need Help Spiral JOBO Tank 2500

[AgX]

Overdevelopment on a blank frame? On blank rebates?

 

[yannjiang]

Here is an example of a light leak in a Jobo tank caused by the lid not being seated properly at first when the lights were turned on. Looks like yours.
View attachment 229350

Hi Pieter,

Actually my sign is in black and not in white on negatives.
I noticed that you also met a dark bar on the left side of the film.
I'd like to know which JOBO Tank you've used and how do you rotate it. Please refer to #24 post for the reason of my request.

Acutally, my problem came from over agitation.

I'll try several times later to find my correct rhythms to well develop my 120 B&W film.

Thank you for your help!

Best regards,
Yann

 

[mshchem]

Yes. I installed the central tube. And I verified with my finger that the tube is well positioned. Because I had one time carelessly. Once the tube is not well placed, the light leak immediately and all film turned to dark. So I ensured it's not a light leak.

When I rotated it, I ensured frequently that the cap was well closed.

Thank you AgX!

 

[yannjiang]

What is the exact number of 2500 series tank you have? The center column you show is for 2550/2551/2553 called multi-tank 5.
If you are using a multi tank 6, 2561, 2563, or a 2830 print tank your column is too short.

I would confirm that the funnel is properly attached to the inside of the lid.

You are using way too much solution for rotary processing.

Hi mshchem,

You're correct. It's a Multitank 5. And I bought it new. The column has a correct length and well attached.

I agree with you. It's really a large amount.
So after the PM, now I rotate the tank upside to make the rotation more gently.

Best regards,
Yann

 

[mshchem]

If you have 2 reels set for 120/220 on the center column there shouldn't be a problem lining up the lid funnel with the center column. You don't need to attach the column to the lid. You load the reels on to the column, put this in tank and attach the lid. If you tip the tank and can hear the column and reels slide up and down the column is too short.

 

[yannjiang]

Overdevelopment on a blank frame? On blank rebates?

Yes. It's a little bit unbelievable. I don't understand the theory but when I slowed the rotary, the side effect decreased. It looks better now.

I'll try a piece of bulk film so that to ensure that there is no leak for the tank.

Yann

 

[mshchem]

Hi mshchem,

You're correct. It's a Multitank 5. And I bought it new. The column has a correct length and well attached.

I agree with you. It's really a large amount.
So after the PM, now I rotate the tank upside to make the rotation more gently.

Best regards,
Yann

OK you have the right column / tank combo

 

[Pieter12]

Hi Pieter,

Actually my sign is in black and not in white on negatives.
I noticed that you also met a dark bar on the left side of the film.
I'd like to know which JOBO Tank you've used and how do you rotate it. Please refer to #24 post for the reason of my request.

Acutally, my problem came from over agitation.

I'll try several times later to find my correct rhythms to well develop my 120 B&W film.

Thank you for your help!

Best regards,
Yann

The marks on your film in the first post are the shadows of the spiral, caused by a light leak. I really doubt agitation would give such distinct marks. I agitate by inverting the tank 180º and at the same time rotating it along its vertical axis and then returning it to its original position, rotating in the opposite direction. The whole maneuver takes a bit over 1 second. I agitate for 10 seconds at the start of every minute of development time.

 

[mshchem]

Yes. It's a little bit unbelievable. I don't understand the theory but when I slowed the rotary, the side effect decreased. It looks better now.

I'll try a piece of bulk film so that to ensure that there is no leak for the tank.

Yann

Make sure that the funnel is secure to the inside of the lid. It attaches at 3 points, that's the only thing left I can think about that could leak light in the tank. Strange? ??

 

[mshchem]

The marks on your film in the first post are the shadows of the spiral, caused by a light leak. I really doubt agitation would give such distinct marks. I agitate by inverting the tank 180º and at the same time rotating it along its vertical axis and then returning it to its original position, rotating in the opposite direction. The whole maneuver takes a bit over 1 second. I agitate for 10 seconds at the start of every minute of development time.

This is what I thought as well. Could be a light leak from a changing bag or other light strike.

 

[yannjiang]

The marks on your film in the first post are the shadows of the spiral, caused by a light leak. I really doubt agitation would give such distinct marks. I agitate by inverting the tank 180º and at the same time rotating it along its vertical axis and then returning it to its original position, rotating in the opposite direction. The whole maneuver takes a bit over 1 second. I agitate for 10 seconds at the start of every minute of development time.

You are using a large tank or a small one? Because multitank is really big, when I revert it, it gave strong wave.

 

[yannjiang]

This is what I thought as well. Could be a light leak from a changing bag or other light strike.

I'm testing the leak, just a few minutes

 

[yannjiang]

Here is the result.

I charge the film in my changebag directly.

7 min D76 stock with pouring time.

I just kick the tank on the ground several times (in this case, I heard waves tapping the wall of the tank) and the black side bars appeared.

 

[yannjiang]

This is what I thought as well. Could be a light leak from a changing bag or other light strike.

I once charged 4 rolls of color films in the tank late night without the rubber closed And I develop it the next day afternoon.
The result is satisfied. So I can say according to my point of view, it's not a leak.

But B&W films are really sensitive to the movement of the film.

BTW, Yesterday I developed a roll of delta 400(120) in Inox tank charged with the same changing bag. Inverting process, no problem with that roll. The result I posted in #7 img_4769.

 

[yannjiang]

This roll I developed tonight in small AP tank.
D76 stock 1+1 14 mins.

Every mins 4 turns clockwise and 4 turns counterclockwise.

Everything is correct except the end. I think it's a big movement for the tail which is not blocked and then slashed by the chemistry left and right. And the sign appeared.

For your reference.

 

[mshchem]

The one constant is the changing bag.. I load everything in a darkroom, even if there's a small light leak, it's 4 meters from where I'm loading the reel. If you have a light leak in a bag it's a few centimeters away. I've used all these different tanks over the years, never had one that leaked light. I'm lucky to have a dedicated darkroom, try throwing a blanket over the changing bag and turn off the lights.

 

[Sirius Glass]

Hi Sirius,

The chemistry is enough. Actually, I prepared it according to the D76 user guide.

Yann

What about the amount printed on the side of the tank?

 

[AgX]

Everything is correct except the end. I think it's a big movement for the tail which is not blocked and then slashed by the chemistry left and right. And the sign appeared.

Again, one cannot explain this arfefact by undue streams of the dedveloper.

 

[AgX]

You checked the tank for light leaks, why not checking th bag the same way?


When you started this thread you did not even mention you used a changing bag.

 

[Yann JIANG]

What about the amount printed on the side of the tank?

Yes. It's a large quantity compared to the minimun requirement by the tank.

 

[Yann JIANG]

You checked the tank for light leaks, why not checking th bag the same way?


When you started this thread you did not even mention you used a changing bag.

Sorry, my fault. But if I have a darkroom, I can complete work in the darkroom to develop a roll without light leak.
I can find out the problem more quickly I think.

But I'm preparing a darkroom when I move to a new appartment ...

 

[Yann JIANG]

The one constant is the changing bag.. I load everything in a darkroom, even if there's a small light leak, it's 4 meters from where I'm loading the reel. If you have a light leak in a bag it's a few centimeters away. I've used all these different tanks over the years, never had one that leaked light. I'm lucky to have a dedicated darkroom, try throwing a blanket over the changing bag and turn off the lights.

I'll have my own darkroom again in the near future . Then I can try the developement in tray

 

[AgX]

Tray development of film is oldfashioned even in the eyes of old-farts Apuggers...


(This stand may end though with the announced reintroduction of blue-only sensitive film from Bergger.)

 

[yannjiang]

Better again.

I need to be more tender. Develop with "Love me Tender"

I think after thousands of rolls I'll change my temper!

 

[koraks]

I hate to say it, but I still see what suspiciously looks like light fog.