Photographic Document

What is made of document photo document?
I am interested in varnish solution not on document. I am interested only in the structure the document. Why is washable, while the ordinary document? It is collected? How did the structure of change in history? I am a collector photographic document. That's why I'm interested.
Wood? Cotton?
Tips for Buying & Using a Camera : How to Choose Photographic Document
MCA Chicago Presents Exhibition that Examines the Artist’s Studio as Subject
William Kentridge, Video subdue of Balancing Act from 7 Fragments for Georges Melies, 2003. Courtesy of Marian Goodman Gallery, New York. CHICAGO, IL.-



