I’m a film guy, but wet plate collodion photography is very interesting. Here are a a couple videos by Quinn Jacobson.
The Wet Plate Collodion Process
Making A Wet Plate Collodion Portrait
Here are more of his videos. Quinn Jacobson on YouTube. It looks like he’s producing a DVD about this. I might have to buy it. I have a great appreciation for anyone who keeps older processes alive in the face of expediency.