I've noticed the "stains" are more pronounced & detailed when the occur on
new concrete. I've also seen stains caused by many different types of
leaves. Most go away in a few days/weeks.
Kenneth Waller
http://www.tinyurl.com/272u2f
----- Original Message -----
From: "mike wilson" <[EMAIL PROTECTED]>
Subject: Re: GESO: Autumn Memories
From: PN Stenquist <[EMAIL PROTECTED]>
Date: 2008/11/27 Thu PM 01:45:43 GMT
To: Pentax-Discuss Mail List <[email protected]>
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 <[email protected]>
>> 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 <[email protected]>
>>>> 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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