This is a useful tip and one I hope we won’t need too much. Andrew’s blog is well worth your visit!
We try our best as film photographers to get a correct exposure every time, but occasionally there are times when we inadvertently cock it up.
It may be because we have forgotten to add extra exposure for bellows extension or a filter factor, or the fact that long exposures need a calculation for reciprocity failure. Sometimes light meters may be set to the wrong ISO/ASA. Then of course there might be a problem in processing with temperature drop, out of date chemicals or just bad luck.
Whatever the reason, we have a thin neg and it is a problem to get the tones that we require in the print.
There is a way to rescue these negatives though, they can be chemically enhanced to increase density and this is most easily done by toning the negative, giving a brown colour to the negative image. The brown image blocks more light…
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