[Alt-photo] Re: Alt-photo-process-list Digest, Vol 807, Issue 1

[Jack Fulton]

Anne:
A delightful and skilled printer of the chlorophyll print is Bihn Dahn, a young (born 1977) Vietnamese photographer who has long
lived in the U.S. . . . If you check out <bihndahn.com> there are examples of his chlorophyll prints plus new daguerrotypes
done in Yosemite Nat'l. Park. He is wonderfully accepting generous person and you might wish to contact him for some
technical help. He does expose a negative to a leave, which makes the image and he then coats it with a resin to create
a permanency.
Jack




On Feb 14, 2014, at 7:56 AM, Tomas Sobota <tom at sobota.net> wrote:

> Anne, I expected that someone more knowledgeable than me would answer your
> question, but since nobody comes forward ...
> 
> If by "chlorophyll prints" you mean something like the juxtaposing of a
> negative on a living plant leaf to get after a time a positive image, my
> answer to this would be an unambiguous "who knows", never having attempted
> this technique.
> 
> Looking at absorption spectra of chlorophyll a and chlorophyll b, for
> example here: http://www.biologie.uni-hamburg.de/b-online/e24/3.htm
> it is apparent that chlorophyll as a whole is mainly sensitive to the red
> and blue regions of the spectrum, with a strong cut-off towards the near
> UV. This, at least in theory, would preclude the use of UV light sources.
> 
> Again, producing an image this way using strong sunlight needs many hours
> or even several days of exposure, do you really mean to have your UV bank
> on for such a long time?
> 
> But if I were you I would try, who knows ...
> 
> Tom
> 
> 
> 
> 
> On Thu, Feb 13, 2014 at 7:16 PM, Anne Chansonette <chansonette at gmail.com>wrote:
> 
>> Does anyone know if it is possible to do chlorophyll prints using a UV box
>> instead of natural light? I am currently in the grey and unending New
>> England winterland and don't want to wait months before working on a
>> project!
>> Anne at lesleyU
>> 
>> Sent from my iPad
>> 
>>> On Feb 21, 2013, at 7:00 AM,
>> alt-photo-process-list-request at lists.altphotolist.org wrote:
>>> 
>>> Send Alt-photo-process-list mailing list submissions to
>>>   alt-photo-process-list at lists.altphotolist.org
>>> 
>>> To subscribe or unsubscribe via the World Wide Web, visit
>>>   http://lists.altphotolist.org/mailman/listinfo/alt-photo-process-list
>>> or, via email, send a message with subject or body 'help' to
>>>   alt-photo-process-list-request at lists.altphotolist.org
>>> 
>>> You can reach the person managing the list at
>>>   alt-photo-process-list-owner at lists.altphotolist.org
>>> 
>>> When replying, please edit your Subject line so it is more specific
>>> than "Re: Contents of Alt-photo-process-list digest..."
>>> 
>>> 
>>> Today's Topics:
>>> 
>>>  1. Re: Gelatin (Michel Debar)
>>> 
>>> 
>>> ----------------------------------------------------------------------
>>> 
>>> Message: 1
>>> Date: Wed, 20 Feb 2013 23:55:36 +0100
>>> From: Michel Debar <michel at debar.org>
>>> To: The alternative photographic processes mailing list
>>>   <alt-photo-process-list at lists.altphotolist.org>
>>> Subject: [alt-photo] Re: Gelatin
>>> Message-ID:
>>>   <CAOtyDPLifUi342p44Anj5k2orcXT=fZkg=JtZfT3y_FqMRzLWw at mail.gmail.com>
>>> Content-Type: text/plain; charset=UTF-8
>>> 
>>> An amazing quote from Douglas Cockerel 1910 book, Bookbinding and the
>> care
>>> of books :
>>> 
>>> [...]
>>> The following is quoted from ?Chambers? Encyclop?dia? on Gelatine:?
>>> 
>>> ?Gelatine should never be judged by the eye alone.
>>> 
>>> ?Its purity may be very easily tested thus: Soak it in cold water, then
>>> pour upon it a small quantity of boiling water. If pure, it will form a
>>> thickish, clear straw-coloured solution, free from smell; but if made of
>>> impure materials, it will give off a very offensive odour, and have a
>>> yellow, gluey consistency.?
>>> 
>>> [...]
>>> 
>>> 
>>> ------------------------------
>>> 
>>> _______________________________________________
>>> Alt-photo-process-list | http://altphotolist.org/listinfo
>>> 
>>> End of Alt-photo-process-list Digest, Vol 807, Issue 1
>>> ******************************************************
>> _______________________________________________
>> Alt-photo-process-list | altphotolist.org
>> 
> _______________________________________________
> Alt-photo-process-list | altphotolist.org