Re: Unknown Processes using silver... any others?

Maybe we can start a "What's this Process?" corner?!!

I would like to find out what other iron based processes
use Silver... is there an agryotype?

Anyone here using it?

What are the others?

Where is the best description of the chemistry for those
process? (other than Dr. W.)

Thanks always,

Ray

-----------------------Au-too:
lets see... there is Cu and Ammonia and that ugly goo...
then there's me, you and a dog named boo.

> > Hi All,
> >
> > I recently had a question from someone who'd
> attended a workshop on what
> he
> > called "alternative photography", wanting to
> identify the process and
> > chemistry they'd used. I don't know. His
> description follows, followed
> by
> > his reply to my request for more details. Any
> ideas, anyone?
> >
> >
> > Thanks,
> >
> > Liam
> >
> >
> > > Description of the quiz I have to solve, colour
> photography:
> > >
> > > Sheets have already been exposed (they contain
> the latent image and are
> > > steel white). The purpose is to developp them.
> > > We work with a very few daylight. The room must
> be dark but
> > > not completely. No artificial lighting is
> needed.
> > >
> > > 1. Sheets are sucessively imbibed with two
> products:
> > > The first one is brown liquid with a medium
> smell, I think often used in
> > > photography.
> > > Sheets are imbebed with this frist product, in
> the darkroom, the prints
> > > become black (like dirty or bad photocopies).
> > > The second product used is transparent like
> water but is very odorous
> > > (when you smell it, it is very aggressive). That
> looks like ammonia very
> > > concentrated and I was told it could be a stop
> bath.
> > >
> > > According to you, what are these two products?
> > >
> > > I made the two first steps and now I cannot
> remove the dirty black veil
> > > on the sheets. How could I do?
> > >
> > > I saw a demonstration during the said workshop,
> this is how it was done
> to
> > > remove the black veil:
> > >
> > > 2. In order to clean this black veil, a powder
> of green-blue colour
> > > is used (sometimes, it is a translucent clear
> blue gel ... like
> shampoo!).
> > > The dry sheets are put into this powder and have
> to stay some hours,
> still
> > > in dark.
> > > When withdrawn, this powder has changed colour
> and is now brown clear
> (as
> > > if it had absorbed the first brown product
> used), after some days, it is
> > > white powder.
> > >
> > > Another way of processing the same step is that
> this powder is directly
> > > mixed into water (water becomes clear blue).
> > >
> > > When this powder is introduced into water and
> mixed: water becomes light
> > > blue. Prints are now introduced in this bath and
> have to stay some 2 to
> 5
> > > minutes, agitated moderately. When withdrawn,
> prints have now their
> > > visible image, covered with a slight blue-grey
> veil.
> > >
> > > My aim is to understand this process.
> > >
> > > According to your experience, what could be this
> blue-green powder or
> blue
> > > gel product? A bleach, a fixer, a developper,
> which one, which kind ?
> > >
> > > 3. We end using either a transparent liquid (but
> sometimes it is
> crystals
> > > like brown sugar which is melted to water and
> becomes the transparent
> > > liquid, sometimes, it is a very light
> yellowish-orange powder : if you
> try
> > > to preserve this powder, it becomes like melt
> and is no more a powder
> but
> > > makes small blots). When put on the wet sheets,
> immediately, they become
> > > clear pictures with all details and colours.
> Then, we dry. Pictures are
> > > ready.
> > >
> > > According to your experience, what could be this
> last product?
> > >
> > > I really need to identify and find the chemical
> and commercial names of
> > > THE TWO LAST products and I would be sincerely
> grateful to you if you
> > > could help me. If you may identify which is this
> process, and in case of
> > > availibility, I would order the stuff from a
> company or a retailer.
> >
> >
> > And then:
> >
> > > I will try there to give you some more
> indications on the process I am
> > > talking about :
> > >
> > > - actually, it seems to be a duplication process
> based on photography.
> The
> > > personn who made this workshop used already made
> colour pictures. These
> > > colour pictures are put in contact with their
> correspondantly same
> exposed
> > > latent pictures (they are white but he told us
> that they were already
> > > sensitised and he avoided direct light during
> work). The aim was to
> > > duplicate the first visible image onto the white
> sheet containing the
> same
> > > image at a latent stage.
> > > - he worked with the described products and only
> aluminium foil to wrap
> a
> > > group of sheets made of : one visible colour
> picture, one latent colour
> > > picture.
> > > - no tray, not tank are used.
> > > - then the two first products are poured
> successively onto this group of
> > > sheets : both become as I said "dirty black"
> (the initial one, and the
> > > white one). Then, he made pressure on it some
> minutes and the aluminium
> > > pack is closed. Still in dark.
> > > - then, still in dark, sheets are withdrawn from
> the aluminium pack. He
> > > used the blue-green powder with water in order
> to have a light blue bath
> > > (under either its powder form or gel form), and
> when washed with this
> > > product, both sheets become covered of a light
> blue veil but at this
> > > stage, image is visible whithout having its
> final colours.
> > > - then, with natural lighting or artificial
> indoor lighting, is used the
> > > last product (brown crystals like brown sugar
> which immediatly melts in
> > > contact with water - highly soluble, or it is
> light yellowish fine
> powder
> > > - very soluble too and fizzling with water or
> with the remaining light
> > > blue veil ? or the possible form of it is a
> transparent
=== message truncated ===

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Received on Thu Aug 19 04:06:07 2004