Photo Engineer , Do you know the secrets of kodachrome ? Can you post whatever you know about the greatest film ?
Mustafa Umut Sarac
There are none. That is the secret.
It is a set of B&W emulsions processed in a B&W first developer and 3 color developers. If the old color developers are used the old color gamut is attained, and if the new color developers are used, the new gamut is attained.
Nothing magic about it.
It can be done at home, and you can even duplicate it using tricolor exposures on TriX Pan and 3 color developers then laminating the film together.
No magic, just hard work.
Darn Photo Engineer you gave away the only 'secret' I know about Kodachrome.
Happy B&W shooting. Grin.
I'm not a technogeek by any means, but a totally fascinating description of Kodachrome, and of Kodachrome K14 processing is in a set of documents describing the theory and operation of the K-Lab processor, the machine that does, or did K14 processing. I thought I had it bookmarked here, but apparently not. Google it. If you can't find it I may have it bookmarked on the machine at work.
There are the patents to read as well. I don't have the references here, but they give the entire process that can be used.
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The fascinating thing about Kodachrome (1st version) to me is that, after chromogenic development of all three layers with the same coupler, by sheer control of diffusing time of a dye-bleaching solution it could be achieved that one single layer was spared. Then doing it all over again…
Photo Engineer , Are patents from Kodak ? There are 7000000 patents at uspto and hundreds may be thousand of them using kodachrome term.
I think I am interested in 3 color developers. Can you write more and give us specific patent class least for this process. Or you can copy and paste from united states patent office lists as a reference ? There are zillions of chemicals and your eye can select them.
I want to do this at home and i need your guide.
Laminating ? I worked at a company which uses 4 color process proofer with heat lamination. I made hundreds of 2 meter long proofs. I think you are pointing this technology.
Actually, I have followed a couple of your previously posted patent links.
Originally Posted by Photo Engineer
The problem with the patent docs is that you have to be a, well, uh, photo engineer to get the most out of them. I'm certainly not one.
Out of your posts and the on-line documents, I have however developed a strong appreciation for the precision that goes into creating the film and processing it with such stunning results.
I find the Kodachrome process fascinating. The precision at which the re-exposures are done without contaminating the other layers, the color developers, etc., all with very consistent results.
Now, from reading the notes on the coating workshops, and how difficult it is to get a single layer coating, B&W only, it just boggles my mind to look at how many layers there are in Kodachrome (or Ektachrome or C41) and the precision by which those must have to be applied for such consistent results.
Another thing that totally fascinates me (yeah, a bit off topic for this thread) is how the CD3/CD4 reacts to produce the correctly colored oxides or whatever the end result of the color development process is, and to have accurate and stable colors as well.
These are all above my head a bit, but I admit some awe and fascination with them.
Sorry for monopolizing this thread, but here's the link I referred to earlier:
Part 3 is the one that goes into the nuts and bolts about Kodachrome and how the K14 process works.
One very fascinating thing is the description on how to salvage a customer's film during a malfunction using a "trouble bucket", but I don't know how successful that actually is.