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

[Tomas Sobota]

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:
> >
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> > 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.?
> >
> > [...]
> >
> >
> > ------------------------------
> >
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> > End of Alt-photo-process-list Digest, Vol 807, Issue 1
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