From: F. Wentzel (fotochemiker@yahoo.de)
Date: 06/06/02-02:44:43 AM Z
Philippe* wrote:
<For making the emulsion, frankly speaking, make sure
that you want to spend time on research. Controlling
everything could take you years.>
This is very important that you understand this point.
an emulsion represents an exquisite balance of
competing chemical and electronic forces, perhaps in
constant flux, and a slight change in one direction
may result in a sudden non-linear response... sort of
like two magnets delicately balanced... the slightest
change and the whoosh! Hey! What happened?
<If you want orthochromatic or panchromatic emulsion,
you'll need to get the right dyes, that are pretty
expensive too>
But don't forget that he wants to make old fashioned
dry plates and the dyes that were available then are
inexpensive. Also, I would suggest experimenting with
natural materials... seems I recall that for example
chlorophyll works as a spectral sensitizer. I haven't
tried it, but I might just out of curiosity!
Also Martin wrote: <I would like to learn more about
panchromatic sensitization. I gathered the
choice of dyes is crucial and extremely subtle
(particularly in regards to compatibility and
supersensitization)>.
Yes this is true. Moreover, it depends upon numerous
other factors, halide composition and crystal habit
for example.
<In summary, it's easy to make a basic silver gelatin
emulsion,[but there are]So many parameters.> which can
or which have to be controlled!
It is a very good, hobby, a true "past time"!
*Philippe is not Galina Manikova (how did that mix up
occur?
Fritz
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