Pacific Film for color prints ASA 80 is not C-41 process!

[Romanko]

Hi Mohmad, thanks for your kind words. I am new to colour process but I've been doing film photography as a hobby for over 30 years. Preparing chemistry does not require a lot of skills and I have access to professional help if needed. Getting certain chemicals locally might be difficult, slow and expensive but this problem can be solved as well.

As I said, I mostly shoot (and develop) black-and-white but I sometimes get a roll of "mystery" colour film from camera collectors and dealers. This is how I got interested in colour film processing. What you said about the benefits of the CN chemistry makes sense and the ability to recover images from long-expired and undeveloped film is probably the most appealing reason for me to try this process.

At this stage the best help would be to point me to literature and resources on the CN process. Is it the same process that was used by Agfa/ORWO and in the USSR? If so, it would have been well documented at least "on the Eastern side of the Iron Curtain". What is the title of the book by Dagnan that you mentioned in your previous posts?

 

[AgX]

Don't let yourself be mislead, there was no "CN"-process at Agfa. Moreover you will not find the process for that film on the net.

But people tried other Agfacolor formulae. Search the forae for such.

 

[Paul Howell]

My 1974 Photographic Facts and Formulas updated by John Carroll has the formulas for Agfacolor, Afgachrome, Kodak E 3 E 4 and C 22, no information concerning Russian films and developers.

 

[Romanko]

My 1974 Photographic Facts and Formulas updated by John Carroll has the formulas for Agfacolor, Afgachrome, Kodak E 3 E 4 and C 22, no information concerning Russian films and developers.

Thank you, Paul. This is very helpful.
I also found this post:
https://www.photrio.com/forum/threads/agfacolor-cn17-process.44279/page-2#post-2421828
with scans from British Journal Almanac 1961. The formulas are for CN17 but CNS films use the same chemistry with minor differences in the process:
https://www.photomemorabilia.co.uk/Colour_Darkroom/Early_Agfa.html#anchorAgfa15rProcess
BJA formulas are also very similar to ORWO/Soviet process (see the link to the Wikipedia article in my earlier posts).

Now, this is the nature of analogue photography and this forum. I started this thread to warn other people against repeating my mistake with that particular Pacific Film stock. I few days later I learned enough about the history and technology of the process to consider mixing my own chemistry and trying it out.

 

[foc]

Would this be of any help?

 

[Romanko]

Excellent! Is that from Photographic Facts and Formulas that Paul mentioned? Thanks for sharing.

 

[foc]

Excellent! Is that from Photographic Facts and Formulas that Paul mentioned? Thanks for sharing.

That was from the British Photographic Journal

I also came across this in Simplified Color Processing Formulas by Patrick D Dignan.


Sorry about the poor quality screen shots.

 

[AgX]

Great to see those 5 processes in one table. Those "minor differences" likely are irrelevant for your case but with fresh film they would, due the different masking technologies empoyed.

That Dignan book I looked through just last week, completely forgot about that CNS page...

 

[AgX]

The film stocks may have changed over time and been made anothere behind the Iron curtain. BUT the colour stocks in that area were all based on the WWII Agfa process. I would guess that many did not even include an Orange mask.

In the USSR dye masking was introduced about 10 years after the first of such in western Europe. Which is early as even in the West the masking technique was still to be developed. At this Orwo was even ahead af Agfa.

 

[cmacd123]

At this Orwo was even ahead af Agfa.

wonder if Kodak did not want to license that patents?

 

[AgX]

There were a lot of approaches done at masking, and during this first patents already got invalid.
Moreover any Kodak patent protection would apply on Orwo as well as Agfa, as both where busy on same markets.

And do not overestimate the inventivity of Kodak. Agfa got a patent on oil-embedded couplers 5 years before Kodak did so.