[Alt-photo] question

bobkiss @caribsurf.com bobkiss at caribsurf.com
Mon Oct 13 19:03:22 UTC 2014


DEAR LORIS,
      Try dissolving some carbon dioxide in the water (perhaps adding some
club soda, soda water or seltzer) and see what happens.
                CHEERS,
                                 BOB

On Monday, October 13, 2014, Loris Medici <mail at loris.medici.name> wrote:

> Thanks Bob, (for the enlightment about Barbados' water quality)
>
> Nevetheless, it's overkill to use special alkali free and/or ion trap
> mounting boards for cyanotypes, using those expensive materials is only
> useful in the peace of mind domain. I believe that leaching hypothesis
> won't happen - sounds like a myth to me.
>
> Actually this is a nice thing to test: I recently moved and my darkroom is
> still packed - as soon as I unpack my materials, I will dry mount a
> cyanotype (made on thin Masa paper) onto highly buffered Fabriano Artistico
> paper and keep the composite in water for 24h. Will provide the before and
> after scans, that way we can see and quantify any probable adverse effect -
> in the worst possible scenario.
>
> Regards,
> Loris.
>
>
> 2014-10-13 15:50 GMT+03:00 bobkiss @caribsurf.com <bobkiss at caribsurf.com
> <javascript:;>>:
>
> > DEAR LORIS,
> >      Well, here are the facts:
> > 1) Barbados is made of an enormous coral reef.
> > 2) Coral is made of CaCO3,
> > 3) a large part of our water supply comes from underground aquifers which
> > leach the CaCO3 out of the coral and deposit it on EVERYTHING.
> > 4) Though CaCO3 has a solubility of 15 mg/liter that figure increases
> > enormously in the presence of carbon dioxide.  Now, let's take the
> average
> > cyano in the average home where the humidity can vary greatly due to
> season
> > and weather and throw in the prevalence of carbon dioxide in most
> > living environments.  The buffer will dissolve in the humidity and leach
> > into the print. Ergo, you can kiss your cyano goodby if you use a
> buffered
> > board.
> > 5) Our local water authority analyzed the deposits and they are,
> > indeed,CaCO3.
> >                 CHEERS!
> >                           BOB
> >
> > On Sunday, October 12, 2014, Loris Medici <mail at loris.medici.name
> <javascript:;>> wrote:
> >
> > > Dear Bob,
> > >
> > > You have water soluble calcium or magnesium hydroxide in your waters
> > then,
> > > because really, CaCO3 is  insoluble. Google it. (Or try to dissolve
> > > chalk...) Calcium has many soluble compounds, but unfortunately,
> calcium
> > > carbonate is not one of them.
> > >
> > > Regards,
> > > Loris.
> > > On Oct 13, 2014 1:06 AM, "bobkiss @caribsurf.com" <
> bobkiss at caribsurf.com <javascript:;>
> > > <javascript:;>>
> > > wrote:
> > >
> > > > DEAR LORIS,
> > > >      The water supply in Barbados disproves your statement that
> calcium
> > > > carbonate is practically insoluble!  There is so much CaCO3 dissolved
> > in
> > > > our water that it leaves deposits everywhere and makes developers pH
> > too
> > > > high.  I have to mix EVERYTHING with distilled water.  Further, a
> high
> > > > humidity environment would cause CaCO3 to leach from the buffered
> board
> > > > into the cyano print and bleach it.
> > > >      I still prefer good ol' 100% cotton museum board with nothing
> > added
> > > > for mounting all my prints.  There are also the high tech papers with
> > ion
> > > > traps...up to you.
> > > >                        CHEERS!
> > > >                                    BOB
> > > >
> > > > On Sunday, October 12, 2014, Loris Medici <mail at loris.medici.name
> <javascript:;>
> > > <javascript:;>> wrote:
> > > >
> > > > > Hi Gert,
> > > > >
> > > > > I don't think you absolutely have to omit alkaline buffered boards
> > for
> > > > > mounting cyanotypes; there isn't any way for the alkaline buffer in
> > the
> > > > > board to reach the cyanotype image that sits on the opposite side
> of
> > > the
> > > > > mounted paper - even so in the case where the composite is fully
> > > > submerged
> > > > > in water; calcium carbonate is practically insoluble...
> > > > >
> > > > > OTOH, when making cyanotypes, you have to refrain from papers with
> > > > alkaline
> > > > > buffer and any alkaline solution during processing.
> > > > >
> > > > > Regards,
> > > > > Loris.
> > > > >
> > > > >
> > > > > 2014-10-12 23:28 GMT+03:00 Christian Nze <christnze at gmail.com
> <javascript:;>
> > > <javascript:;>
> > > > > <javascript:;>>:
> > > > >
> > > > > > acid free but not with alcalin reserve.
> > > > > >
> > > > > >
> > > > > > 2014-10-12 19:41 GMT+02:00 Geert Hoekstra <ghoekstra at solcon.nl
> <javascript:;>
> > > <javascript:;>
> > > > > <javascript:;>>:
> > > > > >
> > > > > > > I would like to ask how to best frame a print made with gum
> over
> > > > > > cyanotype.
> > > > > > > Can you use acid free board? For cyanotype this is not
> > recommended,
> > > > but
> > > > > > > this
> > > > > > > is a combination of two processes.
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > > > Geert Hoekstra
> > > > > > >
> > > > > > > _______________________________________________
> > > > > > > Alt-photo-process-list | altphotolist.org
> > > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > > > --
> > > > > > Christan Nze
> > > > > > Fine art photographer
> > > > > > <http://www.pixtopap.fr>
> > > > > > _______________________________________________
> > > > > > Alt-photo-process-list | altphotolist.org
> > > > > >
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