I found this. Might help.
*Identifying and judging the age of chromogenic prints *
As already noted, when in doubt a color photo is probably chromogenenic.
Chromogenic images often fade and discolor with age, sometimes gaining a
magenta tone. Vintage examples are on fiber based paper. This means that
the back of the photo has a papery, fibery feel, as opposed to the
plasticy feel of recent color photos you own. The front (where the image
is) of these vintage chromogenic photos are usually glossy. This fibery
back with glossy front is unique in color photos to the chromogenic photos.
In 1968 Kodak introduced resin coated paper for color photos. Resin
coated paper has that glossy, plasticy feel on back. This means that if
a photo with a 1950s image (James Dean, Korean War) is on resin coated
paper, it is not vintage. Many modern reprints of both black & white and
color photos are identified as the paper is resin-coated. A quick and
simple ways to identify many reprints.
It is from:
*Photograph Identification Guide
*by David Rudd Cycleback
Hope it helps.
Will try to check with "Operation Photo Rescue" and see what they say.
Right now I am a bit tired, Just returned from buying a replacement
vehicle, as we had a transmission failure Saturday and it would cost
more to repair than the vehicle is worth. VBG And that transmission had
less than 10,000 miles on an AMCO rebuild. Out of warranty based on time.
Paul in Portland OR
On 4/23/2012 1:45 PM, Chuck Norcutt wrote:
>
> Becci said her experience in Japan had shown that many prints that are
> stuck together can be easily separated if they're first frozen. She
> says ice crystals form in between the prints and push them apart. But,
> she continued, there is one big cavaet... don't do that with RC papers.
> If you do, instead of pushing the prints apart, the ice crystals will
> push the emulsion of the RC print right off the paper and thus totally
> destroy it. That's apparently a side effect of the paper's base being
> unable to absorb water. That may be a clue to the answer to my question
> which is: Does anyone know how to definitively identify an RC print?
> Finally, maybe it doesn't matter if you're presented with a thick stack
> of different kinds of prints all stuck together. I wish I'd thought to
> ask her at the time.
>
--
_________________________________________________________________
Options: http://lists.thomasclausen.net/mailman/listinfo/olympus
Archives: http://lists.thomasclausen.net/mailman/private/olympus/
Themed Olympus Photo Exhibition: http://www.tope.nl/
|