From: Wendy Gollihue (wgolli@flash.net)
Date: 11/06/02-03:38:39 PM Z
FWIW: My learning experience with cyanotype was this:
After exposure:
rinse in a bath of water pulling it up and out at different angles so as to
not allow the runoff in the same place everytime. rinse until it's clear
runoff.
you can also put it under direct pressure. happens quicker and will take
more off.
the second bath was a mixture of hydrogen peroxide and water. it was mixed
for us
so i'm not sure of the ratio. the hydrogen peroxide intensified the blue.
however, he once poured the whole bottle in for me to use
and the effect seemed to be even deeper blues.
i believe, at the time, i was using Fabriano HP.
Wendy
-----Original Message-----
From: Jack Fulton [mailto:jefulton1@attbi.com]
Sent: Wednesday, November 06, 2002 12:04 PM
To: alt-photo-process-l@sask.usask.ca
Subject: Re: Problems clearing with cyanotype.
This just sounds plain odd and I'm sure you'll get many ideas from this
wonderful list.
My thoughts:
1. The paper you use may be 'nappy' . . meaning it is thick and absorbent
with a noticeable surface. This could hold chemicals and you'd have a
tough time washing them out
2. Attempt to run a stream of water on a particular spot only. Allow the
water to flow over the paper. Where it strikes the paper w/the most
flow and force, see if that clears.
3. Use a slight first rinse w/5% vinegar, then wash
4. Use a first soak/bath with distilled water only. Change twice, then wash
5. Maybe you did not expose enough. How deep is the blue you obtain? If it
is not a deep blue, you did not expose enough thereby leaving lot of non
converted chemicals in the paper.
Let us know what solves it
Jack Fulton
> I have not been able to clear (i.e. wash out the yellowish stain)
> my cyanotypes on a range of papers. As a test I took a sample of
> several papers and used the following procedure:
>
> - Coat paper using a foam brush. This is done under yellow light.
> - Dry paper in the dark using a small fan to speed drying
> - Wash the paper (mostly in the dark, brief preiods of yellow light)
> for 30min in tap water with minimal aggitation.
>
> Note: The paper receives no exposure. I leave a strip uncoated to judge
> the clearing effectiveness. All inspection is done after the paper has
> dried.
>
> I found a substantial yellow stain remaining on 2 of 6 papers, light
> staining
> on another 2, and only 2 papers which fully cleared. I am testing good
> quality
> papers, and papers that I have seen listed as good for cyanotype in the
> archives of this list, and on various websites.
>
> My questions are; what an I doing which is resulting in the poor clearing
?
> Should I be using some special bath to assist clearing ?
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