From: Jack Fulton (jefulton1@attbi.com)
Date: 11/06/02-12:03:43 PM Z
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 ?
This archive was generated by hypermail 2.1.5 : 12/17/02-04:47:04 PM Z CST