[Alt-photo] question

bobkiss @caribsurf.com bobkiss at caribsurf.com
Mon Oct 13 20:10:10 UTC 2014


Precisely the problem with CO2 in the atmosphere in the average room making
the CaCO3 more soluble and, therefore, more likely to leach into the cyano!

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

> 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
> <javascript:;>>
> 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
> <javascript:;>> 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:;>
> > > <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:;>
> > > <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:;>
> > > > > <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:;>
> > > > > <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:;>
> > > > > > > <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:;>
> > > > > > > <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
> > > > > > > >
> > > > > > > _______________________________________________
> > > > > > > Alt-photo-process-list | altphotolist.org
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> > > > > > Alt-photo-process-list | altphotolist.org
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