I've tried E6 film reversal developed in FrankenC41 using I think print developer as first developer, and I've tried C41 reversal developed in FrankenC41 as well as a "proper" C41 kit.
Results, as they say, were variable.
I think E6 first developers by their nature are quite fast-working and high-contrast, which Caffenol isn't, so it'd be interesting to see what the results are if you try it.
The following shot was initially developed in Rodinal to render a black and white image; then a year later, when I'd learned a bit more chemistry and discovered about rehal/redevelop for C41, I used a simple ferricyanide/Kbr bleach and redeveloped the roll in some FrankenC41. Scans don't tell the whole story, of course, the colour image is a bit thin and grainy.
Original scan of the black and white negative:
Coffee is a beverage and D76 is a developer.
So if I understand this correctly, a year after you developed a roll of film, you developed it again, and got color after you originally developed it as B&W (I realize it was color film)? That's amazing to me. I'm a real novice when it comes to self-processing, so to me, that's mind-boggling!
You have it exactly right.
It's not a new technique, in fact I think there's an old Kodak document about how to do it.
Developing and fixing C41 film in chemicals normally used for black and white doesn't destroy the dye couplers & whatnot that generate the colour when it is processed in a proper C41 process.
So long as you can first recover Silver halides from the silver image on the film (which is what the rehalogenating bleach I mentioned does), a colour developer can then be used to trigger dye production again.
The image is somewhat degraded, but as you can see is just about acceptable. Bear in mind that my example image wasn't redeveloped in a correct C41 process, so it might be possible to get better results.
I find it interesting in and of itself, but there is a practical application: From time to time people find unprocessed old colour film (usually requiring an obsolete colour process) and ask the best way to develop it. I've seen it suggested a few times on APUG that it is first developed in black and white chemicals to recover any images (and scan or print) that might be there, before trying any colour development.
As for the slide film, you'll get b&w negatives from a b&w process. You might be able to extract colour from them again subsequently via the rehal route, but they'll still be negatives and I bet the colours will be way off.
Well Stone, one thing that makes me think about using Coffee developers is that it costing me close to 10 dollars a roll to get my C41 films processed. (Even at a minilab). The idea of combining inexpensive C41 film with a inexpensive developer does have its charms on my pocketbook.
Coffee doesn't do color....
Only B&W ...
For $13 you can buy Rodinal, which will develop 500 rolls for that $13 dollars...
Even cheaper than coffee
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