Since the last test I added some light to my tintype test, about 25% more than I was using before. This was with prepared collodion that was about a month old, so I think this same lighting with fresh collodion will let me use a soft box and back the lights off some. This was taken with bare bulbs just out of frame.
If you're in Denver and interested in having a tintype taken let me know. I shooting 8x10" and 4x5", this was a 4x5" plate.
Special thanks to Jeff Mentzer for not only being a sea captain in the freezing cold "rain" but also for staying up until 3am modeling for tintypes.
And here's a picture of the pleasant "outdoor studio" we were shooting in.