How do you reduce over exposed negatives?

[Vetus]

What is the best way to make a darkroom print from an overexposed negative? Is it possible to reduce negative density with chemicals?

 

[koraks]

I think it's important to distinguish between overexposure and overdevelopment here. Overexposure without overdevelopment generally results in rather dense negatives, but the additional density can generally be 'printed through' and a higher paper grade can be used to boost the contrast if the print turns out a little flat otherwise. Overexposure tends to push the brightest highlights onto the shoulder of the film curve, resulting in flattening out of contrast in that part of the tonal scale. I don't think there's a way to repair this in the negative itself. Burning those areas at a higher contrast grade will help. Overexposed negatives tend to print more grainy than normally exposed ones. This may be a concern at big enlargements.

Overdevelopment stretches the tonal scale of the negative and can result in excessive contrast that cannot be printed well at even a low paper grade (1 or 0). In such cases, it can help to reduce the negative; the most straightforward options are Farmer's reducer or ferricyanide bleach followed by fixing. The net result is the same, but the process is a little different. Farmer's reducer is basically ferricyanide plus thiosulfate; this single bath will reduce silver density without any additional steps. The density loss is also irreversible; there's no way back if you overdo it. A separate bleach step followed by fixing offers more control at the expense of an additional step. Besides, judging the final density after the bleach step may be challenging. Still, if you overdo the bleach, you can go back by redeveloping the negative instead of fixing it, and then try the process again, perhaps with a more dilute bleach.

Personally, I've never really experienced the need or desire to reduce negatives (at least not in their entirity; I do on occasion retouch small bits to remove unwanted objects from a black background for instance). In my experience, in almost all cases, a satisfactory (albeit not necessarily, optimal) print can be made from a negative that's overexposed and/or overdeveloped.

 

[Saganich]

Hi Vetus,

I agree with Koraks, you can usually print through fine if it's a case of overexposure. The shutter speed dial on my camera was malfunctioning during some wedding shots resulting in overexposure. I applied negative reduction using a Formulary kit just because I never tried it befor. Work pretty well. You can see despite the overexposure there was still detail in the dress that would have likely printed ok. The proportion of the A B mixture affects the reduction...equal measures (1:1) will act as a proportional reducer which acts on high and low density areas the same amount. A 1:3, for example, will act as a super proportional reducer which will act faster on the densest areas of the negative. If I would do it again i would try 1:5 or 1:8

 

[Alex Benjamin]

A very useful technique that helps recover highlight details in overexposed and overdeveloped negatives is pre-flashing the print. I prefer that to burning, in many cases.

You can pre-flash the entire print, on just some parts.

Of course, the highlight information has to be present in the overexposed negative.

 

[Doremus Scudder]

Overexposure is not the huge problem it might seem to be. I have made excellent prints from negatives overexposed by three or more stops. Just print through the extra density. You'll need a longer exposure time, of course, but if you're using a film that holds linearity with overexposure, as most modern films do pretty well, that's all you'll need to do.

If you're highlights are blocked up (no separation because they were pushed to the film curve's shoulder), then there's not a whole lot you can do, even with chemical reduction. The separation simply isn't there. Reducing the negative won't add any highlight contrast.

Best,

Doremus

 

[Vaughn]

I have bleached negatives that received one or two stops more exposure than 'normal' as a way to increase contrast...using the bleach just to remove silver mostly from the small deepest shadow areas...where the bleach acts first. Then after a wash, I selenium toned to take the highlights just a bit higher. Worked nicely to fine-tune a negative for alt processes.

I have never tried it, but completely bleaching a negative and redeveloping it to the desired amount is possible, as is bleaching and redeveloping in a staining developer, if that has any effects that one would want.

 

[DREW WILEY]

You can look at bleaching two different ways : overall bleaching versus selective bleaching. Farmer's Reducer is convenient for reducing the thinnest (least dense) portions of a negative, so will actually increase overall contrast,
yet not improve shadow gradation. In other words, it's a chemical tool with a purpose, but isn't likely to help in the case on overexposed or overdeveloped negative.

Besides squeezing the most out of VC papers to tame difficult negatives, another excellent option is to learn unsharp
masking.