I've been trying to work with tin types for a while now. The biggest problems I have had are related to getting good 4x5 holders, emulsion problems, etc. Now, I've realized that most of these could be solved if I could make the tin types in the darkroom. More control that way. Of course this is counter to the way tin types were realized and work.... EXCEPT, I started to think.... If I had a color positive, and threw it in the enlarger, and projected it onto a prepared plate, it should, in theory work the same as if I shot the scene in my camera. Right? The emulsion will still react the same, and I will get a negative image and not a positive. Which is what I need anyway. Plus I could then fiddle with the time, etc. to get the ideal exposure since you need to UNDER expose tin types. Is this a good plan or am I missing something REALLY obvious here?