[Alt-photo] Cyanotypes and Hard Water

David Christensen agitprop at telus.net
Mon May 8 21:57:14 UTC 2017

Thanks for the thoughts, Loris - much appreciated.


On 2017-05-08 2:01 AM, Loris Medici via Alt-photo-process-list wrote:
> I'm taking about something like this
> <https://www.geapplianceparts.com/store/parts/spec/PXRQ15RBL>. (This is not
> what I use, but it's almost the same thing - local brand in Turkey...)
> 2017-05-08 10:46 GMT+03:00 Loris Medici <mail at loris.medici.name>:
>> Using distilled water for washing dealkalized paper or clearing is
>> overkill; you can use soft potable (drinking) water, or better invest on a
>> small reverse osmosis home water purification appliance. I do the latter at
>> home; I get high quality water (better than any drinking water supplier)
>> for consuming (incl. cooking), plus washing / clearing prints...
>> Regards,
>> 2017-05-08 6:36 GMT+03:00 David Christensen via Alt-photo-process-list <
>> alt-photo-process-list at lists.altphotolist.org>:
>>> Ware's cyanotype process specifically mentions that it shouldn't be used
>>> with hard water - which is what we have in abundance here on the prairies.
>>> So, I've been using distilled water to clear the paper after the sulfamic
>>> acid bath (I'm using FAEW) and after the acidic development and both work
>>> well.
>>> But if I use our hard tap water in either step, I notice a difference,
>>> especially after using the sulfamic acid - if I use hard water there, I get
>>> a heavy green cast as soon as I've coated the paper.
>>> Just curious if anyone using the Ware process with hard water is using
>>> something other than distilled water?  Is it advisable to try and lower the
>>> PH in the water and make it more acidic?  Or should I just stick with
>>> distilled water?
>>> Thanks.
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