My wife and I were wandering through an antique shop last evening killing some time when I came across a batch of old silver photos, circa 1900, as I have in other antique stores on other occasions. It's pretty common to find these types of photos by the box full. Must be every town had no fewer than 50 photographers in it taking pictures at reasonable prices people could afford, that so many survived to today. Once in awhile I'd even come across some Dags for sale. Although I don't ever recall coming across any Albumen prints, or any of the other exotic alternate process types. I can understand why glass plates would be so hard to find. Yet you'd think that some of the processes that were put on paper could be found. What about pt. / pd.? Why is it that since I have an interest in Albumen prints that suposedly last for generations, that the only place I can find them is in a museum. How come I can find some in a box tucked away in some antique shop somewhere? It would be kind of nice to have several for reviewing and reference as a small collection as kind of a target to shoot for. Were some of these processes very short lived or too expensive for the common working person to afford? Were some strictly experimental in nature? Would anyone know of any good book titles that outline the history of the photograph, the different processes and how common they were in use? It's so interesting to read all the posts on this site today concerning the different processes of long ago that seemed to all but have vanished! As always, thanks for your input.