Well, it looked better wet!

Here is the image that I got of the Stouffer step wedge. After scanning in the image I could clearly see both a negative yellow brown image and a positive dye image. I tried treating the brown area today and could do nothing to remove it.

The blemishes are due to the acid causing the gelatin to swell in a bubble and then burst. The spots appear to be due to dye washing out or being retained in some of the areas.

I can play with this in PS and get just about any enhancement to show more detail, better color, or even the dual neg-pos images, but this is the raw data.

As the title says, "don't laugh". Because then I would ask you to try it and see how you did on your first attempt!