I walked past this one evening and returned the next day to make an appointment. I had my portrait taken using the "wet plate collodion" process on black glass. You have to see this. It takes a while and it is fun to follow the whole process and to chat with the photographer couple that runs the store. Clearly professionals and very dedicated. Hard to be beaten as experience. Now I have to send my wife there to have her portrait taken as well.
Scan from Silver Portrait Black Glass Ambrotype 20x25cm.