I am processing a collection of photos from the 1950's and 60's and have come upon a group of strange ones. They seem to be made of some sort of celluloid or acetate with what appears to be silk on the back. Can anyone tell me what these are actually made of, what is the purpose of this type of photo, and do I need to store them in a different environment than regular photo prints? Thank you in advance for any information and advice. Terri L. Raburn Reference Supervisor Emporia State University Archives (620)-341-5587 [log in to unmask] A posting from the Archives & Archivists LISTSERV List sponsored by the Society of American Archivists, www.archivists.org. For the terms of participation, please refer to http://www.archivists.org/listservs/arch_listserv_terms.asp. To subscribe or unsubscribe, send e-mail to [log in to unmask] In body of message: SUB ARCHIVES firstname lastname *or*: UNSUB ARCHIVES To post a message, send e-mail to [log in to unmask] Or to do *anything* (and enjoy doing it!), use the web interface at http://listserv.muohio.edu/archives/archives.html Problems? Send e-mail to Robert F Schmidt <[log in to unmask]>