Hi, John and Loris!
One has a problem of choosing between the two controversial things...
Silk does not like soap or alkali water... (one should only use special
enzyme washing for silk),
cyanotype does not like basic environment either... (fogging),
but it is true that both color and contrast of the print will be
effected.
PH-neutral environment will not keep long, it will be effected by
everything around...
Life is nothing else than compromises...
Regards,
Galina.
www.galina.no
On Sunday, March 14, 2004, at 10:39 AM, Loris Medici wrote:
> Hi John,
>
> --- John <ap@darkroompro.com> wrote:
>> At 11:03 AM 3/10/2004 +0100, you wrote:
>>> You should never use soap with silk, just soak it
>> in water and change the
>>> water many times. If your water is basic, add some
>> drops of lemon acid.
>>
>> My apologies if this is simplistic but why
>> would one want a acidic
>> material ?
>
> AFAIK, lemon acid (citric acid in other words)
> dissolves Ferrous ions. The presence of Ferrous ions
> in the support will cause fogging. I think that's why
> Galina offered the idea of treating silk in citric
> acid. In my experience another effect of citric acid
> is reducing contrast (if not washed off from the
> support before sensitizing) and changing the color(!)
> of cyanotype (if gives a different hue of blue).
> Anyway as I will be rinsing silk in mild potable water
> (that incorporates no ferric or ferrous ions) after
> treating in citric acid, I don't think the support
> will remain too acidic - in fact, acidic environment
> is good for cyanotype as it fades in alkali
> conditions.
>
> Hope this helps,
> Loris.
>
> (Please someone correct my if'm wrong in any of above
> statements)
>
>
Received on Sun Mar 14 09:26:00 2004
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