[Alt-photo] Cyanotypes and Hard Water

Loris Medici mail at loris.medici.name
Mon May 8 08:01:00 UTC 2017

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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