So these are the other tintypes made for my history of photography class. The tractor one was made by contact printing with a digital positive. The portrait of one of my classmates was made with a 4x5 camera. The portrait turned out very nice considering it was a three second exposure. It's nice he was able to hold still that long. The crackly looking areas are where the emulsion curled while drying and broke off. It's kind of a bummer, but at the same time adds a little bit of interest. I don't mind them. I plan on making more of these this fall when I come back to school.