From: The Painted Horse (paintedhorse@in-tch.com)
Date: 07/16/03-10:27:58 AM Z
Hi Cris, Katharine, and everyone else.
So, I left the my gum image in the Montana, noon day sun. After two
hours there was definite fading but not total clearing of the image.
I'm sure if I would leave it out more it would clear, and I intended to,
but a disaster took me off in another direction and I could use some
help. While testing the sun clearing of gummed images I was working on
another print clearing with pot metabi (3 tblspns per litre). When I
went to clear, the image began to lift and wash away! And this only
after 1 minute of clearing.
I thought I mixed the pot metabi incorrectly so I started over with
another print waiting to be cleared...same results. Now, I have two
prints in the trash and I'm afraid to try and clear another print for
fear of losing more work. The strange thing is I already cleared one
print for over 5 minutes in the pot metabi a few days earlier with no
problems. Do you need to mix the pot metabi and let it stand for a
while? I mixed this batch and used it immediately. I could try the pot
metabi at 1% so it isn't as aggressive, but thought I would get some
input from the list before I move forward.
Thanks.
Bill-
Katharine Thayer wrote:
>
> Christina Z. Anderson wrote:
> >
>
> >
> > So you could actually just duplicate this with test strips exposed under
> > plain dichromate--my exposures were UV BL 5 minutes.
> > Chris
>
> Okay, the sun came out, and I've got a test going. I tried to stick with
> replicating your results as above for now, with one change. I used
> saturated dichromates, but rather than giving them the same exposure, I
> tried to expose them so the dichromate stain in the borders (I made
> really big borders) was the same shade of brown on both. Unfortunately I
> missed and exposed the ammonium too long, even though its exposure was
> significantly shorter than the time for the potassium. So the ammonium
> dichromate stain is a bit darker than the potassium dichromate stain
> and so any difference I see in result between the dichromates will be
> uninterpretable. At any rate this is really just a quick and dirty test
> anyway to see if I can get the same bleaching you got, even with the
> potassium.
>
> Too sick to do more than this today; I'll report back with my results,
> hopefully before you've left for APIS.
> kt
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