I occasionally buy old glass half plate negatives to print and look into the past, and they arent expensive. As I now have a whole plate contact printing frame, I bought some whole plate ones (8.5x6.75 inches), but it turned out that all except one are positives. They are clearly contact printed back onto plates for some reason (one from a half plate size with a black border; the rest same size). How would these have been displayed? A bit large for a projection one would think. Not sure how I can display them for that matter.