I believe that I cited Tannins as a possible cause, and I mentioned Oak
leaves as a source, (possibly incorrectly), due to their heavy
concentration of tannins. I've actually tried to make iron gall ink
using oak leaves as a source based on an old recipe, with indifferent
results. "Experts" would do well to look at literature published in the
1800's sometimes it has answers to questions they haven't bothered to
ask, and a lot of this stuff will never be on line.
mike wilson wrote:
From: PN Stenquist <[EMAIL PROTECTED]>
Date: 2008/11/27 Thu PM 01:45:43 GMT
To: Pentax-Discuss Mail List <pdml@pdml.net>
Subject: Re: GESO: Autumn Memories
I believe that the leaves are from sycamore tree. Other leaves don't
seem to leave such a distinct impression.
Paul
This seems to be the best answer I can find online.
http://biojournalism.com/95-leaf-shadows-stained-concrete.html
On Nov 27, 2008, at 3:42 AM, mike wilson wrote:
From: "P. J. Alling" <[EMAIL PROTECTED]>
Date: 2008/11/25 Tue PM 04:06:37 GMT
To: Pentax-Discuss Mail List <pdml@pdml.net>
Subject: Re: GESO: Autumn Memories
They look like they could be oak leaves, which are full of tannins.
That would stain the concrete and eventually be weathered away.
What I find odd is that they are (presumably) quite water soluble,
to be leached out of the leaf into the concrete by rain or dew but
then they are not washed away from there. Very, very intriquing.
The other possibility is that it is a wax covering that is somehow
being transferred to the concrete and then resisting removal. Plant
waxes are rather persistent chemicals - carnauba wax, found in many
polishes until the advent of modern polymers, is/was extracted from
the surface of leaves.
mike wilson wrote:
From: PN Stenquist <[EMAIL PROTECTED]>
Date: 2008/11/24 Mon PM 06:51:42 GMT
To: Pentax-Discuss Mail List <pdml@pdml.net>
Subject: Re: GESO: Autumn Memories
Thanks Marnie. I've never seen this kind of impression anywhere
other
than the location where I shot these pics. At least I finally got
around to shooting them:-). BTW, I used the venerable Vivitar
Series 1
90/2.5 at f4.
Do you know what sort of tree it is? It looks as if there is some
residual resin being leached out and leaving the impression.
On Nov 24, 2008, at 12:58 PM, [EMAIL PROTECTED] wrote:
In a message dated 11/23/2008 5:20:53 P.M. Pacific Standard Time,
[EMAIL PROTECTED] writes:
Last year, I noticed a strange phenomenon on my morning runs. It
seemed that on one short stretch of new concrete, fallen leaves
would
leave an image that lasted for months after the leaves had blown
away.
On adjacent surfaces, no images were created. And it seemed
that only
one type of leaf created these impressions. I was amazed to see
that
they endured for months, through rain, snow, salting and plowing.
This
year the process was repeated, and I decided to photograph some
of
these "autumn memories."
Paul
http://photo.net/photodb/folder?folder_id=878138
==============
Way cool. I like the two leaves the best (one up, one down).
Easier
to see
what they are. Interesting. Never noticed that anywhere around
here.
Marnie aka Doe :-)
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