I would like to reproduce the "look" of a U.S. Civil War era wetplate image. It would be nice to use a Photoshp action to do this. Despite that many photographers seem to think that sepia tone is appropriate for this type of image, sepia toning did not become the vogue until sometime in the 1880's or so.
Here is an actual image from the U.S. Civil War...
Here are my tries to reproduce the look..
Including some pseudo print damage...
The wetplate process was sensitive only to blue light. I am wondering if using a blue Photoshop filter on the colored image first and then converting that image to monochrome would work?