C41 Color Processing at home

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f/Alex

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Hi, I'm a somewhat experience B&W photographer, something I never claimed i'd deviate from, similar to how I never claimed I'd go back to digital after picking up film, and now I see myself shooting about 1/5 of the time on a DSLR, regardless, I came into possession of a Rolleicord 2e (I think?, it may be a 3?) recently, and after a lot of repair work I've done myself, the low speed times are all working right. (still working on the high speed times, separate mechanism, i don't have equipment accurate enough to test the times other than guess and checking with paper negs or such.) Anyways the Rolleicord (and moving into a new apartment with my girlfriend) has inspired me to delve into colour processies. As an experienced B&W developer, working both with agitation and stand developing, holding temperatures in water baths in the latter at 70F, for 30-50 minutes, I am wondering how difficult home processing colour is, and if it's worth doing. Also any (CHEAP) equipment is a *MUST HAVE* or advice is an appreciated.

-Alex.
 

cmacd123

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actually flic has a fairly generic You tube video of the c-41 process



some folks rather than using teh fancy water box should will use a dishpan with a Sous-vide heater borowed from the kitchen supplies. (since it only touches water it should not be a problem.)
 
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f/Alex

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@cmacd123 Do you know of anyone doing it without a sous-vide or an aquirum heater, but instead with just a water bath and adding water to keep the temperature level every few minutes? I've used this technique with stand developing with pyrocat in B&W and it worked great, but B&W is less temp sensitive so.
 
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f/Alex

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Also any advice on push or pull processing, what its effects are? I almost never shoot box speed in B&W so. And color film seems to get much more expensive the higher you go in ISO, I'd like to shoot a few images of my partner around our apartment, and 200 ain't gunna cut it most of the time
 

cmacd123

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Back in the olden days folks use a water bath and a thermometer. Some kits sugested "Drift processing" where you heat the developer a couple of degrees above the rated temperature and figure that it will drift down by the end of the process. Really depends on how much you want to wing it. for example in the you tube video, I linked he does not start timing until after he does the fiirst agitation, but that is effectively adding 10 seconds to the time. He then waits to add the stop bath, while the developer on the surface of the film may stiill be working.


as far as the question about Pushing, the limit is the risk that the three layers will "Get out of step" and give you a cross over where the correction for the highlights is 180 degrees out from the correction for the shadows.
 
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f/Alex

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Roughly how much leniency on average does one have with push processing, is this a 'shadows are out of wack' at 1/2 a stop thing? 1 stop? more? The film I've bought is kodak gold (it's cheap, if I commit I'm interested in trying slide film, ektachrome maybe? I'm a kodak simp, ain't good for my wallet though).
 
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f/Alex

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Also the cinestill kit is what i'm thinking of purchasing, it's just what's available from B&H without extended shipping times. Is cinestill known for making decent color developers?
 

MattKing

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Also the cinestill kit is what i'm thinking of purchasing, it's just what's available from B&H without extended shipping times. Is cinestill known for making decent color developers?

They probably don't make it.
They probably market something manufactured by others.
 

koraks

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@fAlex in the following I'll focus mostly on color negative, unless indicated otherwise.

Also the cinestill kit is what i'm thinking of purchasing

Personally it's not the brand I'd put at the top of my list. If you can get something else (anything, really), I'd try that first.

Please do give color development a try; it's not particularly difficult and if you can do B&W, you can do color just as well, especially color negative.

They probably don't make it.

That's quite possible. Their chemistry also changes from time to time and very obvious flaws are sometimes corrected later on, such as their initial ferricyanide bleach for C41 now being a more usual EDTA bleach. But the way their color chemistry has been evolving does not instill much confidence. The main benefit they offer is a small price for small quantities, and that's certainly attractive. But it does appear they are cutting corners here and there to achieve this. It may be (probably is) a deliberate choice to occupy the lower tier in the market segment, but this also carries risks.

Back in the olden days folks use a water bath and a thermometer. Some kits sugested "Drift processing" where you heat the developer a couple of degrees above the rated temperature and figure that it will drift down by the end of the process.

I've done both, and still do from time to time. Both approaches work fine. The water bath method had new life breathed into it when people started using the sous vide cookers also mentioned earlier. Works great if you don't want to spend much on equipment. Just get a generic sous vide stick, some glass bottles and a plastic storage tub to fit everything in.

Do you know of anyone doing it without a sous-vide or an aquirum heater, but instead with just a water bath and adding water to keep the temperature level every few minutes? I've used this technique with stand developing with pyrocat in B&W and it worked great, but B&W is less temp sensitive so.

I've done exactly that when I started with color and it worked OK. A few notes on this:
  • The bigger your water bath is, the more stable it'll be in terms of temperature. A big mass of water will retain its temperature longer.
  • That's relevant because color processing temperatures are higher than B&W, and the bigger the temperature difference between your bath and your room, the quicker it'll cool down.
  • Only the color developer step (and in E6, the first developer) is temperature critical. It's OK if temperature drifts a little in subsequent steps. Don't worry about it.
  • With color negative, you can actually develop at a lower temperature for a longer time. Many people have produced acceptable results this way. However, for optimal results, I'd recommend sticking to official process parameters; i.e. 3m15s development time at 38C/100F for C41.
  • There is a little margin for error in terms of temperature. In fact, my opinion and experience is that this margin is quite broad unless you're very exacting in your work and demand extreme consistency from one roll to the next.
Concerning how much leeway/margin for error you have, here's a practical illustration: https://tinker.koraks.nl/photography/ginkgo-leaves-on-expired-vericolor-film/ Two sheets of film from a (near) identical exposure, but processed at different times & temperatures. Both sheets produced acceptable prints (especially given that this was decades expired color film); they were different, for sure, but both usable. So part of the story is also about your requirements and expectations.

Having said all that - it's not particularly hard to keep a water bath at 38C for a couple of minutes as you develop your film, and a sous vide stick costs about as much as a handful of film rolls (you don't need the Cinestill one marketed for photo purposes). So why not just do it properly, especially as you start out?

as far as the question about Pushing, the limit is the risk that the three layers will "Get out of step" and give you a cross over where the correction for the highlights is 180 degrees out from the correction for the shadows.

I 'push' film quite regularly; for instance, I overdevelop my ECN2 film consistently so that the contrast gradient is sufficient for optical printing. There's actually quite a lot of leeway in this regard. You can easily overdevelop by 50% of so and still get perfectly fine prints. With scans it's even easier since you can correct crossover to a large extent and more easily than in printing.

Also any advice on push or pull processing, what its effects are?

Push processing gives a steeper contrast curves, so the negatives will have more 'punch'. To a limited extent, this can compensate for underexposure, but keep in mind that underexposure will always remain that. Deep shadows are lost, no matter how you develop your film. Sometimes that's acceptable.
Pull processing on color negative film in my experience gives lifeless negatives that look soft and anemic. Given the fact that color negative film already has massive latitude (for overexposure at least), there's also no really compelling reason to do pull processing.

Start by exposing and processing your film normally. Then experiment to taste. Anything goes.

If 200 doesn't cut it for your photography, consider the following:
  • If you only scan and digitally edit, a decent scanner will eek out shadow detail and allow you to boost it in post processing in ways very difficult to achieve when optically printing. So feel free to shoot your 200 film at 400, process normally (or overdevelop by 20%) and enjoy.
  • Don't expect to get much more than 400 from a 200 film regardless of what magic you throw at it. Above that, shadows will start to break down and whatever you are left with in the low values will be a grainy mess with wonky colors.
  • For best results, shoot at a wider aperture or slower shutter speeds, or simply buy faster film. The bad news about that is of course that Portra 800 is gorgeous, but also handsomely expensive.

The film I've bought is kodak gold (it's cheap, if I commit I'm interested in trying slide film, ektachrome maybe?

Color negative and slides are totally different animals. Either isn't better than the other. Shoot slides if you want slides, shoot color negative if you want/need the latitude and especially if you want to make optical enlargements. If you scan, there are pros and cons to either; slides tend to scan easier in terms of color balance, but the high densities on slides are a challenge for scanners. The color negative, it's just about the opposite. However, a skilled person with a halfway decent scanner can produce excellent results from either.

Gold is a perfectly fine film; I know a successful artist who shoots all their art on Gold; she produces sometimes massive prints from 35mm negatives.

Ektachrome is also a great product, but for your low-light endeavors it's not of much use. ISO 100 isn't much if you want to shoot indoors. And slides don't have much dynamic range, which at the same time makes the results so nice and snappy (a 5-stop light range is expanded into the full contrast scale of the film), but it also means that high-contrast scenes pose a challenge. Indoor photography is often high-contrast, and this tends to be disappointing with slide film.

There's so much more, but let's keep it at this for a moment.

The shoe manufacturer's slogan applies here. Just do it.
 
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f/Alex

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Ektachrome is also a great product, but for your low-light endeavors it's not of much use. ISO 100 isn't much if you want to shoot indoors. And slides don't have much dynamic range, which at the same time makes the results so nice and snappy (a 5-stop light range is expanded into the full contrast scale of the film), but it also means that high-contrast scenes pose a challenge. Indoor photography is often high-contrast, and this tends to be disappointing with slide film.
Most of my work is on a tripod using low speed B&W film, a lot of which at night, in which case I end up with 3-5 minute exposures. It's very rare for me to shoot anything higher than 400, and even then, mostly I live in the 100 range.

Gold is a perfectly fine film; I know a successful artist who shoots all their art on Gold; she produces sometimes massive prints from 35mm negatives.
I don't own a paper processor (does anyone? they seem big, bulky, and pricey), the nearest colour labs I've been recommended are in the city, and that's a whole hour and a bit away from me. I'm exclusively interested in scanning, which I may do with an actual scanner my university has, or I may do with my 5D and a tablet acting as a light box.

Having said all that - it's not particularly hard to keep a water bath at 38C for a couple of minutes as you develop your film, and a sous vide stick costs about as much as a handful of film rolls (you don't need the Cinestill one marketed for photo purposes). So why not just do it properly, especially as you start out?
I will look on FB marketplace and ebay for a cheap one, I've been told it'd be useful for my push processing endevours as well, but I'm on a very tight university student budget, as always.
 
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f/Alex

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Could I get away with a 100w aquarium heater? it's much cheaper than even a used suis vide?
 

pentaxuser

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Could I get away with a 100w aquarium heater? it's much cheaper than even a used suis vide?

Never used one so I can't say but you might need to check what temp an aquarium heater goes up to. 38 C is way above what ever tropical fish can live in let alone be comfortable with

pentaxuser
 

koraks

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Could I get away with a 100w aquarium heater?

If it has a temperature setting that works for color processing, yes. I think many aquarium heaters don't go quite that high. The term 'bouillabaise' comes to mind...

I don't know what you find prohibitively expensive; I paid €40 for my sous vide stick. I bet you could find one for $40 if you shopped around a bit. If you're willing to purchase from China, I see them well below the $30 mark.

An aquarium heater may not be as exact as a sous vide stick; they tend to have a higher hysteresis. However, I wouldn't worry about this. If you prefer an aquarium heater, just get one as well as a decent thermometer, try the thing out and measure the temperature that you set on the heater to verify the scale is correct. Especially the cheaper aquarium heaters may very well hold the tank at a few degrees over or under what you set them to.

I don't own a paper processor (does anyone? they seem big, bulky, and pricey)

Yes, I do. Several people around me do. But they're bulky, and pricey!
Before I owned one (several now, in fact), I used to develop my color prints in trays, at room temperature. Just like B&W prints, only in the dark instead of under a safelight. That worked fine, too.

Scanning of course is fine, too; it's very convenient, quick and the digital darkroom is incredibly flexible.

I've been told it'd be useful for my push processing endevours as well

Most of the time when I do push processing I just develop a little longer, but at the same temperature.
The approach of raising temperature for push processing is/was more associated with the minilab world. These machines ran at a constant speed, so if you wanted to vary the extent of processing, all you could do was change the temperature. In a home setup, it's usually easier to change the temperature.

I'm on a very tight university student budget

Surely, you have a water cooker in your home. Get a thermometer and a big plastic storage tub. Fill the tub with tap water. Now add boiling water until you reach the required temperature. Keep the water cooker at hand and add boiling water whenever the temperature drops. Hey presto - you are now your own, self-contained sous vide/aquarium heater! It's a little more work than an automatic device, but works well. Many of us started that way. I sure did.
 

Truzi

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I've used aquarium heaters - the type with a rheostat - in large coolers full of water. I had to pull the knobs off and reposition them so they could warm to a higher temperature. I also used cheap aquarium circulation pumps to keep the water temps homogenized.
It's not ideal, but cheap.

It took time to get the temps where I wanted them, and a lot of trial and error. Good thermometers are a must in this situation too. I just set up the coolers and heaters, walked away for a few hours, checked, made adjustments, etc. I did this a few times (without processing) to make it easier to replicate. I did the same when it was time to develop, but all the experimenting made the setup quicker (but still slow).

I'd not use Styrofoam coolers - they tend to seep water (at least the cheap ones I used did). I had set everything up in a bathtub, though, so it worked out.
 

MsLing

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Also any advice on push or pull processing, what its effects are?

Like B&W,push color film would lose things in shadow.And because of the different rate of chemical reaction in red blue and green sensitive layers with color developer,colors you get might be a little bit inaccurate.Also like B&W,push will change gamma in different layers and reflects on contrast of R,G and B.Contrast mismatch problems that lead to visible color changing,are introduced with push process.What Kodak publishes is that cyan(R) and magenta(G) dye layers are more dramatic than yellow(B) dye layers.But that's not a really big deal,the effection can be rectified during scanning or printing.

More details you can see here:https://www.kodak.com/en/motion/page/push-pull-processing/

For push process,Kodak z131 mentioned that add 30s while developing to push 1stop.Only Portras are recommended in the document.But according to my personal experience,Gold200 and Vision3 500T,though it's not recommended to be developed in C41,work acceptable with push.

Pull would work better in color reduction ,because to the extent,pull seems like overexposure,and offers small grains.Otherwise,only little bias of color might happen if we pull.Usually it's unnecessary to do pull process,color negs' wide dynamic range will protect your works.

High quality C41 processing is a rabbit hole.If you want to increase you ability in color field,I highly recommend you download,print,read and practice Kodak z131,the EB of C41.
 
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MsLing

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Another interesting fact is that different C41 kits offer different and visible look.Some formulas even make a magenta look even if all of them have a same name.
 

koraks

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Pull would work better,because to the extent,pull seems like overexposure,and offers small grains.

I've done experiments with pull processing on C41 film. Grain didn't improve much, but acutance was dramatically affected (in a negative way) and the net result was a bland mess. I don't recommend it.

Another interesting fact is that different C41 kits offer different and visible look.

This is entirely possible and I also noticed very subtle differences between self-made color developer (C41) and FUJI HUNT produced chemistry. However, these differences were minimal and only visible in direct side-by-side comparisons of color checker charts. For regular photography, they were not meaningful. If you get significant differences between one kit and another, something's wrong with either kit (or both), and/or with the processing.
 
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