Getty just published a nice (technical) article on alternativephotography.com. My portion of the piece is about halfway down the page (embedded screenshot). 
Preserving the Chemical Photography Era
The project is called, “Preserving the Chemical Photography Era”. A very important project. I’m honored to participate. I have some more work to do for them, too; negatives, Albumen print, and some unvarnished pieces.
I’m not sure who the Bulgarian is they are referring to in the article. I’ll have to find out. I’m not sure what else you would call a Collodion image made on aluminum other than an Alumitype.
I need to update my gallery on alternativephotography. There are Collodion photographs there from 2003 and 2004! The images aren’t bad, but you can really see where I was (technically) at the time.