C-42 is Kodak's home-version of C-41?

You're welcome! )))

RPC said:

I never new the ultimate source of that formula, I think I found it on the Gerald Koch post you mentioned...

I have found an alternate formula from a patent:

Water (distilled) 800.0 mL
Potassium Carbonate 34.30 g
Potassium bicarbonate 2.32 g
Sodium sulfite, anhydrous 0.38 g
Sodium metabisulfite 2.96 g
Potassium Iodide 1.20 mg
Sodium Bromide 1.31 g
Hydroxylamine Sulfate 2.41 g
CD-4 4.52 g
Water to make 1 liter
.

Click to expand...

Hello!
I want to try a developer with your formula. You can answer me:
1) The pH of this developer?
2) shelf life?
3) replace sodium bromide with potassium bromide ???

Thanks in advance!

LSV said:

Hello!
I want to try a developer with your formula. You can answer me:
1) The pH of this developer?
2) shelf life?
3) replace sodium bromide with potassium bromide ???

Thanks in advance!

Click to expand...

I just use it as is and don't check or adjust the pH and get good gray scales, color and contrast. YMMV. If you want to check it, it should be 10.0-10.1 for perfect, in-spec results.

In full, glass containers, sealed tightly it lasts many months.

Use 1.5 grams/liter of potassium bromide in place of the sodium bromide.

RPC said:

I just use it as is and don't check or adjust the pH and get good gray scales, color and contrast. YMMV. If you want to check it, it should be 10.0-10.1 for perfect, in-spec results.

In full, glass containers, sealed tightly it lasts many months.

Use 1.5 grams/liter of potassium bromide in place of the sodium bromide.

Click to expand...

Thanks again!

RPC said:

I just use it as is and don't check or adjust the pH and get good gray scales, color and contrast. YMMV. If you want to check it, it should be 10.0-10.1 for perfect, in-spec results.

In full, glass containers, sealed tightly it lasts many months.

Use 1.5 grams/liter of potassium bromide in place of the sodium bromide.

Click to expand...

Another question:
Do you need to use a STARTER for the developer or not?
If necessary, what is the chemical composition of the starter?
Thank!

No, there is no starter needed for it. Remember to use distilled water when mixing.

RPC said:

No, there is no starter needed for it. Remember to use distilled water when mixing.

Click to expand...

Yes, of course-only distilled water!
I understand about the STARTER, thank you!
I will inform you about the results ))

LSV said:

Yes, of course-only distilled water!
I understand about the STARTER, thank you!
I will inform you about the results ))

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You are a respectful and struggling young man.
So I will give you advice as a result of my humble experience ..
All C41 processes published in the forum are of very little life. They need strong isolation elements, and in any case you must use a bleaching solution for the process, there is some secret relationship between the image quality and the bleach in the process (C41) and in fact a solution Good bleach is very expensive.
In general, I moved away from all (C41) operations. I went back in time a little back and went to the old process, but it is 100% official, meaning that those who invented it are the scientists of the Agfa company, and of course it underwent rigorous tests.
- There were rumors saying that this process was designed to work with old emulsions with specific specifications, and it turns out that all these gossip are just theoretical nonsense and a pseudo-philosophy, far from the truth.

- I prepared and used the operation Agfa (CNs) and it does not need (Ki) at all ,,
And it works at 20 degrees Celsius. The process as a whole is very, very cheap, and it has the advantage that the developer lives for two months as long as he is in a dark glass bottle.
This is the best process in my view that gives you standard results, because it is the official Agfa process and is not the invention of any researcher or amateur.
But it depends on the German (TSS) developer or the American (CD1). I replaced it with the developer (CD2) I have, and it worked perfectly ..
- I use cheap copper bleach, he does the job assigned to him perfectly without problems ,, only he needs to use a washing solution before and some bleaching.
It just needs distilled water and really needs sodium chloride without iodine, and I have verified that this condition is really important,
If you want to go in this direction, I can help you.
Moscow does not believe in tears.

mohmad khatab said:

You are a respectful and struggling young man.
So I will give you advice as a result of my humble experience ..
All C41 processes published in the forum are of very little life. They need strong isolation elements, and in any case you must use a bleaching solution for the process, there is some secret relationship between the image quality and the bleach in the process (C41) and in fact a solution Good bleach is very expensive.
In general, I moved away from all (C41) operations. I went back in time a little back and went to the old process, but it is 100% official, meaning that those who invented it are the scientists of the Agfa company, and of course .....

Click to expand...

Thank you for sharing your experience!

LSV said:

Thank you for sharing your experience!

Click to expand...

Hello dear Russian brother.
It is my pleasure to provide any assistance to you (if this is in my ability)

Thanks and regards.

Here are a few more photos that I took from homemade chemistry.
Camera AGFA Billy Record II (120 Roll Film - 6x9 cm pictures).
https://photos.app.goo.gl/MFQqMXPkqX3zkX3j9

The weather in Moscow is bad, everything is gray and dreary))

LSV said:

Here are a few more photos that I took from homemade chemistry.
Camera AGFA Billy Record II (120 Roll Film - 6x9 cm pictures).
https://photos.app.goo.gl/MFQqMXPkqX3zkX3j9

The weather in Moscow is bad, everything is gray and dreary))

Click to expand...

Well ,, that's cool, my friend.
Greetings to you .

LSV said:

Here are a few more photos that I took from homemade chemistry.
Camera AGFA Billy Record II (120 Roll Film - 6x9 cm pictures).
https://photos.app.goo.gl/MFQqMXPkqX3zkX3j9

The weather in Moscow is bad, everything is gray and dreary))

Click to expand...

George Eastman founded Eastman Kodak in Rochester New York because the area is the largest natural darkroom in the world.

Another experiment with home chemistry and color film development.
Film Kodak Gold 200
Compared bleaches on Fe(III)EDTA and on Potassium Ferricyanide.
Tank rotation speed - 75 rpm.
Scanner: Epson Perfection 3170 Photo


Developer - recipe post # 54 C-42 is Kodak's home-version of C-41?

Bleach on Potassium Ferricyanide ( K3[Fe(CN)6] ) (Time 6:30)
Potassium Ferricyanide - 40 грамм
Potassium Bromide - 10 грамм
Water to 500ml
The recipe is here: http://www.bonavolta.ch/hobby/en/photo/c41_ra4_chemicals.htm

Bleach on Fe(III)EDTA (Time 6:30)
Fe(III)EDTA ... 65 g
Potassium Bromide ... 55 g
Ammonia solution 25% ... 10 ml
Potassium Nitrate ... 15 g
Acetic essence (70%) ... 15 ml (10-15 ml)
Water to 500ml
pH - 6.2-6.4 (regulate Acetic essence)

Fixer (Time 6:30)
Sodium Thiosulphate - 100 g
Ammonium Chloride - 43 g
Water to 500ml

The result is here: https://drive.google.com/drive/folders/1_FvIZxqfTEXGX8jqRs23gqLNlT-28OZ7?usp=sharing
In the appropriate folders. Designated the exposition in the names of the files

*****
Next time I will try the recipe developer from RPC Post #2
C-42 is Kodak's home-version of C-41?

Fuji Superia 200, exp. 2007 as E.I. 160
manual cont. agitation. Developer: https://www.photrio.com/forum/threads/c-42-is-kodaks-home-version-of-c-41.89135/page-3#post-2203116