I have scanned some film negatives (35mm) and have run into the classic orange color problem. Using the Gimp, simply inverting the color of the image (Colors->Invert) leads to a very discolored image ...
I have been using selenium as the last step during negative development to increase durablilty of the negative. I was told that it can be used to increase the contrast of the negatives too. I tried, ...
I've noticed that developed colour negatives usually have an orange layer. Is this an artifact of an old printing process, required by the chemistry, or is there some other benefit to it?