There are small differences from RPC's formula, which he stated is a modification of the above formula. For the record, here's the one-litre formula from patent 5827635 referred to above. RPC: Thanks for posting the patent-number. In my experience the mask color seems to more closely match Kodak C-41 negs than the developer you mentioned and required less pH adjustment.Īnother poster on APUG, Stefan4u has posted a formula he concocted he calls C-27 which I have not tried but other APUG members have and claim it works very well. I have found an alternate formula from a patent:
I never tried sulfuric acid to adjust the pH but it is better to use 28% or glacial acetic acid instead of white vinegar, that is what I use now, as it took me a lot of white vinegar to adjust it and that causes a slight dilution of the developer. The results I got were mine, yours and other's experiences may differ. Formulations aren't usually exact, pH-wise, as water pH may vary, even distilled, which I use, unless corrected for in the formula. I am no chemist, just a darkroom enthusiast but in response to your pH question, it is common practise to adjust the pH of color formulas to adjust for contrast and parallel curves. I never new the ultimate source of that formula, I think I found it on the Gerald Koch post you mentioned. Why did Kodak publish a formula that gives the wrong pH? Or did Haist publish it with an error? Or is antical #3 a strong acid so that omitting it (as RPC did) causes this large pH-shift? For that matter, does anyone have information on the C-42 process? My internet search turned up nothing. See this thread: (there was a url link here which no longer exists) Add potassium hydroxide (10%) or sulfuric acid (10%) to adjust pH.Įxcept for insignificant rounding differences, the formula above is identical to the "official" C-41 formula posted by Gerald Koch (there was a url link here which no longer exists).Īlthough the pH should be 10.00, RPC reports that the pH comes out to 10.4-10.5, and that he adds white vinegar to adjust pH. Samyang 10mm f/2.8 ED AS NCS CS Lens (Fujifilm X Mount) SY10M-FX Watson CGA-DU07 Lithium-Ion Battery Pack (7.4V, 650mAh) B-3601 Genaray SpectroLED Essential 360 Daylight LED Light SP-E-360D file/ d/ 11fAQovYFGr7sKVQjDTc23uJeVFkNXXxy/ view?usp=sharing Meade Polaris 127mm f/7.9 Equatorial Reflector Telescope 216005Ĭobra CXT345 Walkie Talkie 23-Mile Radio (Pair) CXT345 ion-audio-ipa77-tailgater-wireless-bluetooth-tailgater-ipa77-337832-manual
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KODAK C 41 FILM MANUAL
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KODAK C 41 FILM MANUALS
Operating instructions and pdf manual for use - User manual Color Film Chemistry KodakĬolor Film Chemistry Kodak Photography - Darkroom - Color Film Chemistry - Instructions for use The English user manual for color film chemistry Kodak can usually be downloaded from the manufacturer‘s website, but since that’s not always the case you can look through our database of Kodak brand user manuals under Photography - Darkroom - Color Film Chemistry - User manuals. COLOR FILM CHEMISTRY KODAK User manual | | User manual here!
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