[Alt-photo] question

Loris Medici mail at loris.medici.name
Mon Oct 13 19:06:23 UTC 2014


Will do that too; but mind that dissolved CO2 is acidic (that's why it
dissolves CaCO3)

Regards,
Loris.
 On Oct 13, 2014 10:03 PM, "bobkiss @caribsurf.com" <bobkiss at caribsurf.com>
wrote:

> 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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