Developer with ortho-Phenylendiamin

[olk]

Hi,
is there a b/w developer beside W665 that uses ortho-Phenylendiamin?

 

[Rudeofus]

I am not aware of any commercially packaged developer with o-Phenylenediamine, but there's a patent full of formulas with it. Not exactly sure how useful they are ...

 

[Alan Johnson]

Edwal 32 non-staining superfine grain developer:

Water...............................................900ml
Metol.................................................12g
Fine grain sulphite........................90g
Ortho-phenylenediamine...........12g
Sodium bisulphite..........................10g
Water to make...................................1L

Good for subjects having strong contrast.
Increase time by about 6% for each subsequent film.

 

[Sidd]

Can anyone tell me what is the shelf life of W665 developer. And whether it is reusable?

 

[olk]

Can anyone tell me what is the shelf life of W665 developer. And whether it is reusable?

Yes, Windisch wrote that W665 is reusable (15 films per 1l) and W665 should be stored in a almost full bottle.

 

[olk]

Edwal 32 non-staining superfine grain developer:

Water...............................................900ml
Metol.................................................12g
Fine grain sulphite........................90g
Ortho-phenylenediamine...........12g
Sodium bisulphite..........................10g
Water to make...................................1L

Good for subjects having strong contrast.
Increase time by about 6% for each subsequent film.

'fine grain sulphite' means sodium sulphite?

Increasing time is not so practical for film calibration ... do you know how a way to replenish Edwal-32?

 

[Alan Johnson]

It may be of interest to try it with ascorbate, as in Jay DeFehr's Halcyon which uses PPD:

Halcyon p-phenylenediamine developer test

Opinion is divided over PPD, some say it has unique properties, others that it was replaced by Microdol (now discontinued) and by Perceptol (still available) as an ultrafine grain developer.(See the Film Developing Cookbook by Anchell and Troop for more details) PPD can cause permanent allergy...

www.photrio.com

 

[Alan Johnson]

'fine grain sulphite' means sodium sulphite?

Increasing time is not so practical for film calibration ... do you know how a way to replenish Edwal-32?

Modern Developing Methods for prints and fine grain negatives : Edmund W. Lowe : Free Download, Borrow, and Streaming : Internet Archive

The Edwal LaboratoriesModern developing methods for prints and fine grain negatives (3rd ed.)1947

archive.org

I found it in this book, p16, p38. I don't think there is a replenisher.

 

[olk]

It may be of interest to try it with ascorbate, as in Jay DeFehr's Halcyon which uses PPD:

Halcyon p-phenylenediamine developer test

Opinion is divided over PPD, some say it has unique properties, others that it was replaced by Microdol (now discontinued) and by Perceptol (still available) as an ultrafine grain developer.(See the Film Developing Cookbook by Anchell and Troop for more details) PPD can cause permanent allergy...

www.photrio.com

Replacing PPD by OPD doesn't work.

 

[Sidd]

Why not try to make one new developer with o-phenylenediamine out of scratch? My serious request to you experienced friends here.

 

[Alan Johnson]

There are 3 others listed in "Developing" 1948 p151 by CI Jacobson.

 

[olk]

There are 3 others listed in "Developing" 1948 p151 by CI Jacobson.

Unfortunately I don't have access to this book.

 

[Alan Johnson]

You realise that these were abandoned after the discoveries of [Henn?] of more dermatologically safe alternatives?

 

[Sidd]

You realise that these were abandoned after the discoveries of [Henn?] of more dermatologically safe alternatives?

But I have read that OPD is safer than PPD and used as an ingredient for hair dyes in some countries?

 

[Alan Johnson]

But I have read that OPD is safer than PPD and used as an ingredient for hair dyes in some countries?

"o-phenylenediamine...........is similar to the p-isomer ..........[but] is less harmful to the skin..."
Photography Theory and Practice 1970 vol 4 $582 Clerc & Jacobson.

 

[Lachlan Young]

You realise that these were abandoned after the discoveries of [Henn?] of more dermatologically safe alternatives?

Henn's work on D-23/ D-25/ Microdol seems to have killed research (at least from the big names - Kodak, Dupont etc) into PPD in B&W fine-grain developers pretty stone-dead at about the same point his colleagues were producing CD-3/ CD-4.