Rob - the key was in this paragraph in the second doc you sent me:
The key to determining that a gelatin-silver photograph was made
before 1920 is looking for silvering. These early prints had a
tendency to silver, especially at the edges. Silvering is when it
appears
as if the silver has come to surface. It is often more noticeable
when
viewed at a specific angle to the light. While not all early
gelatin-silver
photographs will have silver, if one does have authentic silvering
it is
almost certainly old.
It is simply called "silvering" - duh.
In my case, I knew the approximate date from a variety or observations about this box
of stuff I have.
and the clothes the people are wearing help, too.
And I had researched enough to learn that the split back of the postcard didn't happen
until, um, I think it was 1907. (damn, now I cant find those notes...) Anyway,
Edwardian period, I think.
Thanks for those super links!
ann
Rob Studdert wrote:
> On 18 Jun 2002 at 20:18, Ann Sanfedele wrote:
>
> > Bob Walkden wrote:
> >
> > > Hi,
> > >
> > > Nice card. Are you thinking of solarization?
> >
> > annsan replies:
> > hmmm. maybe, but maybe also " Mackey (sp?) lines" is what I was thinking.
> > I don't think, though, that this was something intentional. I would guess that
> > the alteration may indicate insufficient fixing (whatever the result is called).
> > Could this happen from years of exposure to the sun? Or just extreme age and
> > poor fixing? Ann ponders....
>
> Hi Ann,
>
> The following pages contain some info that may help:
>
> http://www.classyimage.com/picdate.htm
> http://www.auctionbytes.com/pages/abu/y201/m11/abu0054/s03
>
> Cheers,
>
> Rob Studdert
> HURSTVILLE AUSTRALIA
> Tel +61-2-9554-4110
> UTC(GMT) +10 Hours
> [EMAIL PROTECTED]
> http://members.ozemail.com.au/~distudio/publications.html
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