ThomasT

For me RA-4 gives better results. ENC-2 has 80% of CD3 concentration than RA-4. So I dilluted it accordingly and pretented its ENC-2. Both is cross develepment. RA-4 gives better colours, except that blue sky gets a magenta cast. But the question is: what happend here.

Hi, I recently developed a Vision3 250D in RA-4 (diluted 1+4). Before developer remjet remover and watering. After developer stop (2.5% acetic acid) then bleach and fix. Problem is that something went wrong. The film is too dark, means too red or too magenta. Not the normal orange you know, but a dark red. The scans clearly show that the red channel looks good. As expected. Red is fine. The green channel has a big problem. Even so the blue channel but slightely less. Looks like solarisation. All what is black or darker is too green. Except when there is much red. E.g. red back lights from cars. And the grain looks much stronger. So thats where the dark mask color comes from: the green and blue channel are also developed in unexposured parts. Just like a (invers) pseudo solarisation. White -> slight magenta cast Lighter colors -> ok Darker grayish colors -> too much green Parts with less green but much red -> ok (surprisingly) Dark parts -> too much green, but less The error is not correctable with simple gradiation curves. In the lights there is a slight magenta cast. So green seems slightyl underdeveloped in the lights. I will upload a file where you can see it, if you want. My question: what went wrong? 1. Of course its a cross development sing RA-4 instead of ENC-2. But the 50D I developed two weeks before was fine. 2. Developer too old? Several weeks in my room where we had up to 30°C in the last month. 3. Contaminated? 4. Reaktion with remjet remover? Contamination? I dont think its light coming into the tank. The result is constant on the whole film. Thomas

Hello yesterday I developed a Vision3 film with digibase C41 set. (plus remjet remover, but thats not the problem, I hope) It's completely underdeveloped. Hardly any images on it. Even the exposed parts at the end are not really black. Theres definitely not problem with camera or filmstock. Developer is two months old. Is this too old? I developed 3 films in this 500ml. Shouldn't be a problem. I doubt that vision 3 cannot be developed in C41, since there are Cinestill. Thomas

Of course it should and is. But also in the undeveloped parts! E.g. on the sides where the perforation is. Thats my problem. No. Its not. C-41 developer uses CD4 as develeoper agent. As well as E-6. RA-4 developer uses CD3. ENC-2 developer uses CD3, too. So the idea is to use RA-4 dilluted to 4+1 (a fifth more water to get same CD3 concentration) as a replacement for ENC-2 developer, since ENC-2 chemicals are hard to get in small units. (there are a kit from bellini but costs about 60 pounds ...) ENC-2 is for cinefilm. Like the mentioned Kodak Vision3 films. CD3 and CD4 are both derivates from p-phenylendiamin as all(?) used color developer agents. But I really have no clue in chemistry. Maybe alan_marcus can say more.

Ah. Thanks. I didn't know this in this detail. This explains why unbleached, but undeveloped, film looks darker. Thanks. I knew this already. I made my diploma about color crosstalk of negative film (actually 5244 intermed). But since they are already colored, development should not enhance the density of the mask (in the non exposured parts, like on the perforation border). But Vision 3 devoloped in RA-4 is significantly darker. (more magenta, red) Kodak Vision3 are intended to be processed in ENC-2 not C41, like most cinefilm. C-41 uses CD4 as developer agent, ENC-2 uses CD3. As well es RA-4. Thats why someone recommended to use RA-4 as a replacement for ENC-2 developer.

Hello. I hope there is someone who can help me. I did some experiements with color development and got some interessting effects. Don't know if it's my foult (e.g. contaminied chemistry etc.). 1. A new Kodak Gold 200, C41 standard developmen (dev, time and temp), but with bleach bypass. I used a stop bath made of 2.5% acetic acid after developer. Results are quite good, but mask color/base density is quite dark. Like a black fog over the negative. When I bleach the film (and end piece) and fix again, than this dark fog disapeared. So I assume it's silver because it can be bleached away. But why? What is it and why is it there. Film is defenitely not exposed by wrong light. And if the fog wouldn't be consistent, but it is. 2. I developed an Vision3 50D (5209) with RA-4 developer. Result is quite good looking at the neg by eye. But mask color is red. Normal mask color of an Vision3 is bright orange. Looks like a constant magenta fog. Than I took to pieces of an undeveloped 50D. One piece I put into bleach, than I put both in fixer. Both pieces are clear with a normal orange mask, but the one without bleach is slightly darker. (Its not the remjet! The remjet was removed almost completely by the fix and I used a remjet remover additionally) For my unerstanding only development should influence mask color by decolorize the colored couplers. Can someone explain these effects? Thomas