For the past couple months, I've been processing my own C-41 film at home (so far in 35 mm and 120, color 4x5 is pretty hard to manage on my budget, but give me time...). At first, I bought the Kodak Flexicolor "makes a gallon" sizes from Adorama, and was pretty happy with the results, though temperature control at 100F plus or minus half a degree was fairly annoying.
Once I used up the Kodak developer (which has about half the life of the other chemicals), I tried a formula I found on the Internet several years ago: Dignan NCF-41, a 2-bath, room temperature C-41 developer, originally published a little over ten years ago.
I'm hooked; I'll never buy Kodak C-41 again. The original specification calls out 75 F for this developer, but since it's a two-bath, it's very tolerant. At higher temperatures, it won't overdevelop; it can't, because it develops until it exhausts the developer carried over in the emulsion from Bath A into Bath B. Below 75 F, I've found I need to give a little longer in the B Bath, to allow time for development to complete, but recently I've gotten good results at temperature as low as 70 F by adding 33% to the recommended Bath B time.
Best of all, this stuff is *cheap*. Even though the main component, CD-4, costs about $110 a pound, a liter of NCF-41 Bath A uses only 11 grams, so the 100 grams I paid $24 for will make about nine liters of working solution. And, as a two-bath developer, the Bath A lasts almost forever -- at this point, I've processed almost as much film in the first liter (replenished to maintain volume by adding more of the same working solution) than a gallon of Kodak Flexicolor Developer would manage, and its still going strong; even if I do as is commonly done with Diafine and discard the solution when I've used up an equal volume of replenisher, I'll get hundreds of rolls from the first two liters, and have three more batches the same size yet to be made up from the original 100 g of CD-4. The Bath B is mostly sodium carbonate, with just 1 gram of potassium bromide per liter, and though it's used one-shot, I use laundry grade sodium carbonate and get a hundred liters from a $3 box of washing soda.
The bleach (I'm still using Flexicolor Bleach II, though that will change soon) and fixer (also still using Flexicolor Fixer, again about to change) work fine at the lower temperature, though I've extended the times from what Kodak recommends -- since these processes are carried to completion, they can't be overdone, but I'm finding that ten minutes in each of bleach and fixer is sufficient even at 70 F.
Kodak's Final Rinse will probably continue in my darkroom -- it's hardly more expensive than PhotoFlo 200, cheap enough I doubt it's worth trying to replicate -- and unlike bleach and fixer, it's not chemically obvious what it does or how to tell if it's not working.
Bottom line, once I start mixing my own bleach and fixer for my color film, I'll be able to process a roll of 35 mm or 120, or four 4x5 sheets, for under fifty cents in chemicals including the amortized cost of the water filter I use to keep tap water junk off my film. At that price, I might just be able to afford to start shooting large format color...
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