|README.md||2 years ago|
WARNING: What follows is for the advanced darkroom practitioner. It is not for beginners and people should be well acquainted with safety and good darkroom practices. If you do not already have a least one film/developer combination "dialed in", don't bother with any of this.
I've been a black and white silver photographer for over four decades. In that time, I've worked with a large number of films and developers, eventually settling down on a few combinations that worked well for me. In every case, I managed time and temperature and agitated the film according to the developer manufacturer's instructions.
Recently, I became aware of a newish staining developer called "Pyrocat-HD", invented by Sandy King. This developer has a great many claimed virtues among them:
This monograph is not about Pyrocat-HD, although all the testing was done with it. Pyrocat-HD turned out to be a gateway drug to my learning about "stand" or "still" development. This is an an old technique used by some of the masters like Atget. Today's modern masters like Sandy King and Steve Sherman are making use of variations of stand development to great advantage. But, in the words of Sandy King, "It is fraught with danger". The technique is tricky and prone to failing rather horribly. So ... don't try this with pictures that matter to you without making backup negatives. I promise you're going to mess some of them up.
When stand (or one of its variants) works, it gives you negatives of great apparent accutance, full box ASA speed and - this was most important to me - a way to increase mid-tone contrast without blowing out the highlights. It is mid-tone contrast that gives prints that "snap" we're always looking for. David Kachel has a very good commentary on this:
For example, I recently shot a scene in which the darkest shadows were on Zone III, and the brightest highlights (snow) were well into Zone VIII. Depending on how you do exposure control, this is either normal development or slight N-. The problem is that the dominant geometry in the scene was a bunch of boards that - at best - showed a Subject Brightness Range of about 3 stops. This was the most important part of the scene but, I was stuck with two bad choices:
Normal, or worse still, contracted development would shove all these tones together to produce low local contrast in the mid-tones. i.e., A picture that held the entire tonal range, but boring because the primary image geometry had low local contrast.
But if I did N+ development to improve middle tone contrast there was good chance the snow highlights would blow out to Zone IX or X. Because Pyrocat-HD is a semi-compensating developer, I likely would have been able to burn through this if I could control the burn geometry properly.
This is where a form of stand saved the day. By developing the negative using stand techniques, I was able to get full box film speed in the shadows, jack up the mid-tone contrast, and preserve the highlights from getting pushed up too far.
When reading about stand development, you'll run into a lot of discussion of "edge effects". These occur as a byproduct of the way stand works chemically, especially when using Pyro staining developers. The edge effects show up as a line in a transition between a light and dark subject. In the extreme case, it can actually manifest itself as a "halo" behind the transition. (This is one of the reasons you don't want to overdo stand development.) This edge effect is perceived by the human eye as higher sharpness. It's sort of an illusion, but it's a useful one. (For those of you who do digital post processing, this is approximately the chemical equivalent of an unsharp mask.)
Stand techniques depend on a basic property of how film develops - The highlights develop much faster than the shadows. One Kodak engineer was heard to say that "Development ends after 3 minutes, the rest of the time is spent increasing contrast." This is just another way of saying the same thing.
As the highlights develop, they exhaust the developer around them much faster than the shadow areas do. In other words, the brighter the object - say white snow - the quicker it will exhaust the nearby developer. The darker the object - say a shadow - the slower it will exhaust. Mid-Tones live, well, somewhere in the middle.
For those of you with a technical bent, I highly recommend a careful reading of this explanation of film behavior by David Kachel:
Normally, we don't notice this because we agitate regularly thereby replenishing the supply for fresh developer everywhere, most especially the highlights that have "run out of" useful developer.
Stand development exploits this by ... not agitating at all or very little. Highlights are allowed to exhaust because they develop quickly and don't really need more developer. But by letting the film sit in a really dilute developer solution for a looooooong time without agitation, the shadows continue to develop and so do the mid tones. This means we are:
In effect, stand techniques add two other things we can control about how we develop film. In addition to time and temperature, we now add developer dilution and frequency/duration of agitation as development controls.
It's worth mentioning that this is super tricky to get right. In the words of a retired Kodak film engineer, "Kodak did not consider still development in formulating its films. It is not a recommended practice." That's right, it's not. And you're not supposed to tune your stock Ford engine to produce more horsepower either. It is not recommended by the manufacturer ;)
As film develops, it produces chemical byproducts like bromides that we usually don't notice because ... we're agitating regularly. This serves to "wash away" these byproducts with fresh developer. But when you stand develop, these byproducts can come to rest on your negative and interfere with the development. This results in streaks and marks on your negatives and can be entirely ruinous to the process. That's why the Great Yellow Father, Kodak, recommended so strongly against this approach. This mess is often referred to as "bromide drag".
All manner of techniques exist to avoid these problems, with varying degrees of success. Among them include:
Formally and properly, stand development should be done with the negatives laying flat in a tray or the equivalent. They should stand laying down not hanging vertically in a tank. My testing suggests that this is not absolutely necessary and at least one other approach will work.
It's also worth noting that the photographers who pioneered this approach a hundred plus years ago were using very different films and plates. Modern thin films do have more a propensity for bromide drag than their grandfather films did.
Still, this can be conquered and - at least in my view - should be in the arsenal of tools for any advanced monochrome silver photographer.
There are many references to this sort of development in the literature and the terminology isn't used consistently. For our purposes we'll define things as follows:
Normal Development - Using developer at recommended dilutions and agitating regularly once or twice a minute.
Stand Development - Using highly dilute developer, agitating vigorously for the first 1-2 minutes and then just letting the film sit untouched in the developer for 45-60 minutes or even more.
Semistand Development - Using highly dilute developer, agitating vigorously for the first 1-2 minutes, and then once again for 10-15 seconds at the development halfway point. So, for a 60 min stand, we'd agitate at the 30 min mark.
Extreme Minimal Agitation (EMA) (Attributed to Steve Sherman). Using highly dilute developer, agitating for the first 1-2 minutes, and then again for 10-15 seconds at 2 or 3 evenly spaced intervals for the remaining time. Say we initially agitate for 2 minutes and want a total development time 30 minutes. We could split up the remaining 28 minutes into three intervals and do 10-15 second agitations at 9 minutes, 16 minutes, and 23 minutes.
Semistand and EMA were conceived to overcome the nasty development artifacts (artefacts if you live in the UK ;) like bromide drag. The occasional short agitation during stand development reduces the likelihood you'll see these gremlins appear in your negatives.
Much to my surprise, as I tested, I discovered that even the single midpoint agitation of a semistand development can significantly increase apparent contrast and - in the case of Pyrocat-HD - level of stain (as well as Film Base Plus Fog). So each of these techniques has a place.
I exposed and developed a variety of films using all four of the development techniques above. As I did so (and failed more often than not) I began to do my down "dialing it" of what worked and what did not.
For all cases, I used Pyrocat-HD as the developer at a nominal 68F/20C.
I should mention that I designed and built my own temperature-sensitive timer to keep temperature considerations out of mind in the darkroom. You can find the details here:
This is certainly not a requirement and you can do ordinary time/temperature corrections as usual in your own work.
Pyrocat-HD is a developer mixed from two stock solutions. Dilution is expressed as
Part A : PartB : Water. For Normal development, dilution was
1:1:100. For the various stand tests, dilution was either
Developer and fixer were mixed with distilled water.
Films tested included Kodak TXT, Agfapan APX 100, and Ilford FP4+ in 4x5 sheets. I also used 35mm Tri-X and Agfapan APX 100 for testing.
Development was in open tanks and - in a few cases - a Yankee 4x5 tank with insert.
A variety of different film suspension systems were tried including Kodak "framed" film hangars, a Yankee 4x5 tank, and a "frameless" Kodak film hanger.
Film was presoaked for 5 minutes in running water to wash off the anti-halation layer and prepare the emulsion to accept developer. It's not clear this is entirely necessary with open tanks but it does no harm.
First of all, these are my findings, built on my workflow and darkroom technique. These are intended to be guideposts, not definitive rules. They are intended to be a starting point for you to explore, not some final word in how to do this stuff. Every statement below should be read to say "In my case ..."
Stand development is really fussy about how the film is held in the developer. Framed hangers and the Yankee tank insert all showed bromide drag effects in varying and unpredictable ways. My theory - which I cannot prove - is that turbulent effects and developer trapping is taking place along- and under the hangar frames/insert supports and promoting bromide drag.
Semistand development is at lower risk of this, but still shows some evidence of bromide drag with framed hangers and tank inserts.
For this reason, all my sheet film is now hung using old frameless Kodak hangers. They have minimal points of contact with the film. A likely viable alternative here would be a dental X-ray film clip. In either case, having more than one sheet in the tank will be tricky to agitate because there is no frame to keep it in place. Patience is your friend here.
How good is this? I was able to get a perfect negative with Stand development (no agitation during stand period) using these hangers.
Well... almost perfect. The negative shows just a slight hint of bromide drag. It is at the end of that negative that was at the bottom of the tank - exactly where gravity would land it. The exact same scene exposed identically but processed with EMA and Semistand do not show this artifact.
In short, I was unable to consistently get Stand processing to produce artifact-free negatives. So, even with better film suspension, at least one midpoint agitation is a really good idea. As a practical matter, there is no reason to do Stand over Semistand or EMA. Both of the latter techniques give good results.
I did some testing with 35mm on stainless steel reels, but dunked into open 4x5 tanks rather than the usual daylight tanks favored by small format shooters. (I did not try 120 rollfilm.) As expected, Normal development worked fine. To my surprise, Semistand was OK as well. I was expecting bromide drag problems because of the way the reels support the film. Again, I think strong initial agitation helped here. I've also noticed a considerable difference of reel spacing from different manufacturers. If you are going to do 35mm or 120 this way, I'd stick with the old Nikor reels. They're a bit expensive but widely available on eBay.
Stand and Semistand did best with the
1.5:1:200 dilution. EMA did best with the
1.5:1:150 dilutions. This makes sense, since EMA times tend to be a lot shorter than true stand development and more dilute developers will take longer to act on the shadows.
Both Stand and Semistand really need 45-60 minutes to fully do their jobs.
Both Stand and Semistand need a full 2 minutes of initial agitation and it needs to be "vigorous". Again, I suspect - but cannot prove - that really kicking the development off hard at the beginning, reduces the likelihood of bromide drag later.
EMA was fine with only 90 seconds of more normal initial agitation.
The single agitation introduced at the midpoint in Semistand development seems to noticeably reduce the risk of bromide drag.
The single agitation introduced by Semistand development seems to noticeably increase overall contrast and density as compared to a no-agitation Stand period. It's not night and day, but given that doing this reduces the risk of bromide drag, it's probably the preferred long stand technique and this extra contrast has to be considered.
Given a normal dilution of
1:1:100 and an EMA dilution of
1:1.5:150, I found that a good first order guess for EMA development time was to double my Normal development time with 2 or 3 equally spaced agitations during the stand time.
You can do contrast control with EMA much like you do with Normal development - increase- or decrease overall time. With Stand and Semistand, it's a bit more difficult because you really want that long development time to fill in the shadows and crank up the mid-tones. I've not tried it, but changing developer dilution is likely a better tactic for these development methods.
You can overdo this. If you have a scene that already has good mid-tone local contrast, these techniques can give you a cartoon-like local contrast expansion.
All the stand techniques gave me full box speed ASA for every film I tried.
You have to be merciless to "expose for the shadows" properly. If you underexpose, nothing can save you. You cannot develop content that isn't present in the negative. If you overexpose, you will get the entire tonal range of the image sliding up the H/D curve in ugly ways with stand techniques. In this regard, exposure control and ASA management is much more demanding than most conventional film-developer Normal development methods.
Yes, in certain cases. Low- or no agitation development is slow and finicky. But, it really shines when you want to emphasize mid-tone local contrast, but have a competing highlight that would get blown out (or hard to print) if you just did N+ Development.
More generally, these techniques are great when you need to get maximum shadow detail, but reign in highlight placement.
Stand techniques also work nicely when you want to get best apparent sharpness on subjects that show a lot of bright-to-dark transition lines - for example, articulated rock faces.
Think of stand as another arrow in your quiver. You won't always use it, but it can be a really nice enhancement to your arsenal of tools.
I strongly recommend that, if you're going to try this, take at least two exposures of every scene you care about. Try one with stand techniques, and have a backup you can process normally if needed.
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