If you want to push things farther then it behooves you to periodically test. Fwiw there was a time when most color negative films were susceptible to this, but later dyes were mostly immune to this.įor small scale processing the safe thing is to just follow the directions for the bleach. if you use a fixer with too low pH you can allegedly convert some cyan dye back into a leuco dye. So if you put it in the good bleach, this finishes oxidizing it, and it is now a complete cyan dye. It's essentially an "incomplete dye," one that has not been fully oxidized. I should probably say something about what IS a leuco cyan dye. This test should be done with a "known good" bleach. If it DOES then the assumption is that it DID have some leuco dye. Now, if someone were to hand you a piece of film, and ask if it had any leuco dye, the standard test would be to rebleach (and refix, and wash, etc.) to see if the cyan dye increases. There's more to it than that, but my point is that the standard method is to make sure the bleach is ok, then you just presume that the film is also ok, at least with respect to cyan leuco dye. Now the question is, how do you know if the bleach is ok? The standard method is to process a piece of specially exposed film, aka a "control strip," and use an instrument called a densitometer to see if you got the proper amount of cyan dye. So the main effort goes into making sure the bleach is ok. In commercial processing the assumption is that if the bleach is ok then there will not be any leuco dye. Yep, it's colorless you can't just look at it and see it. Of course, there's the alternative, to either one-shot the color developer, which is what Kodak recommends (mix the whole 5L replenisher, than make up tank solution using starter and water, fresh for each developing session), which is still fairly economical given the life of the other components, or reuse tank solution with time compensation (I'd use the figures usually given for kits if I did this - usually add 15 seconds for each roll after the first, up to 8 rolls in a liter, more at your own risk). Other than color developer, the other components (bleach and fixer) keep much like B&W chemicals - in fact, I'm currently using C-41 fixer that I got for nearly free (because it was already old) more than a dozen years ago for my B&W film. When I buy new, I'll mix the whole 5 liters of replenisher, put it in a wine box, and make up two liters of tank solution - that'll be a couple years' supply of replenisher, and enough tank solution to do 4x5 when I'm ready to spend the money on 4x5 color. I only mixed one liter of tank solution and one of replenisher, however, and the C component of my Color Developer Replenisher has almost certainly gone off in the bottle by now (replacement Color Developer Replenisher concentrate set is only about $25 plus shipping). I'd say it averages a couple rolls a month. I don't shoot or process a lot of C-41, and at least for the first six months (last process was on WPPD, one roll of NHG800 and one of XP2 Super) my Color Developer was doing fine. I read the instructions and there is no specifications for longevity or how long I would be able to store it, is there any info how long this kit holds up? I would not mind getting the 5000ml kit and divide into 2 batches but I'm not sure if that is a great idea any recommendations? If that option is not working out I would opt for the 2500ml Kit. Sadly the 1000ml kit is not working out for me since my Tank holds 1250ml for 3x 120 rolls. I have a few questions regarding the kit, I see on Fotoimpex they offer 3 versions:ġ000ml Kit for 39,00 EUR = 28 rolls = 1,39 EUR per rollĢ500ml Kit for 49,00 EUR = 50 rolls = 0,98 EUR per rollĥ000ml Kit for 69,00 EUR = 100 rolls = 0,69 EUR per roll Overall the kit seems to exactly what I was looking for. I found a comment from you in this THREAD regarding development times. I will keep watching that thread and it would be cool if you would create your own thread with your whole workflow and experience, I think lots of people would appreciate it. I read all of your posts in this THREAD and I have to say I don't think I shoot enough to make this whole replenishing project work, I probably will hold on to the thought for now. Also the EU is kind of hefty when it comes to chemical imports. Thank you for the suggestion but I don't think it is available in Germany, at least I couldn't find a seller.
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