Insane. Some of his plates are nearly perfect, some are interestingly flawed, and a couple are just flawed:
http://ianruhter.tumblr.com/

I guess they would qualify as tintypes, since it's a negative image on a black background, which makes it look like a positive.

Huge amount of chutzpah, some truly great images therein, and yay for the mad scientist ethos!