U of S | Mailing List Archive | alt-photo-process-l | RE: archivalness of gum

RE: archivalness of gum

On Fri, 21 Dec 2007, BOB KISS wrote:

	Which is what I asked in my posting three hours ago...has anyone
determined that the ghost image is, indeed, pt/pd metal?  I found the same
ghosting on a BACKING board with silver-gelatin prints.
	Jury still out?

Another kind of ghost image is often found in old almanacs, and compendia, from about turn of the 20th century. They often have a tissue over the frontispiece, which may be a photograph rather than a gravure (I don't remember -- but maybe someone else does) -- and the image often offsets onto the tissue, in fact I suppose that's why the tissue is there.