Confirmation reg Fomapan 100

[Photo Engineer]

Prewet does not appreciably affect development time. This was discussed in many many posts in another thread. If you could find that one, it would be very useful.

PE

 

[Mats_A]

No, just pre-soak with water 2-3 minutes and then in the developer for the same regular time.

Is your emulsion nr. : 016254-05 (exp. 2012-05)

BTW you're not missing something.

Best regards,

Robert

Emulsion nr: 016154-05 (exp 2011-03)

r

Mats

 

[Mats_A]

Ok. Thanks everybody for yr advice. I will run a test tomorrow with prewetting and water stop bath.

Btw, I sent a mail to Fomafoto where I bought the film and they offered to take it back and send a new box. Good service. But I will test it once more before I send it.

r

Mats

 

[RobertV]

Emulsion nr: 016154-05 (exp 2011-03)

So the same emulsion nr. Thanks.

I will inform the factory about this possible failure.

regards,

Robert

PS. About Fomafoto: They only did the right thing.

 

[Mats_A]

So the same emulsion nr. Thanks.

I will inform the factory about this possible failure.

regards,

Robert

PS. About Fomafoto: They only did the right thing.

No, it is not same nr. Mine is 016154-05. You said 016254-05

r

Mats

 

[RobertV]

Well to be more clear: From the same master roll.


Robert

 

[37th Exposure]

If I'm not mistaken Fomadon LQN contains carbonate as an accelerator. It may react with any acidic stop bath to create pinholes. Try another developer without carbonate like Fomadon P or whatever or use water rinsing instead of an acid stop and see what happens. Just developed some Fomapan 400 (35mm) in Foma R09 (new type) and Fomadon P and no problems under a 10x loupe. Stop bath was FomaCitro. Neither developer contains carbonate as far as I know.

 

[RobertV]

Fomadon R09 (new) is Rodinal (R09 one shot) since end 2008 Foma is filling up their Para Amino Phenol developer in Germany at the former Agfa plant.

A Carbonate or Bi-carbonate can be only a problem on the film emulsion when the pH is close to 14.
In Diafine you can have such a situation hence in the instructions a water stop (extra flush) is recommended.

A pre-soak will extent the film emulsion a bit so that before development the very small holes are closed.

 

[Jim Noel]

Foma, and other older style emulsions, are more sensitive to temperature and pH changes.
Keep temperature constant between solutions. They should not vary more than 1-2 degrees F.
If you use an acid stop bath, make it a very weak one. A half teaspoon of household white vinegar in a liter of water is sufficient.

 

[Photo Engineer]

A Carbonate or Bi-carbonate can be only a problem on the film emulsion when the pH is close to 14.
In Diafine you can have such a situation hence in the instructions a water stop (extra flush) is recommended.

A pre-soak will extent the film emulsion a bit so that before development the very small holes are closed.

The carbonate only becomes a problem at an acid pH.

A presoak will not allow closing of small holes. It will swell the emulsion and help prevent air bubbles from forming.

PE

 

[Mats_A]

I will give an update on this for anyone still reading this thread.
Today I developed a neg that had been dusted before put in the holder. Then stored in a zip-lock bag. After exposure back in bag.
Developed with prewetting - developer - water stop - fix - hca - wash.

Result: About the same amount of holes in the emulsion. I will return this package and hope for a better one.

r

Mats