Re: Renew don't Recycle Ferric

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From: Eric Neilsen (e.neilsen@worldnet.att.net)
Date: 05/02/00-07:11:55 PM Z


Carl Weese wrote:

> Eric,
>
> My understanding based on communication from Dr. Ware as well as Roger
> Vail who teaches the Ware/Malde ammonium method is that two-step drying
> was their recommendation. Worksheets in the Ware/Malde method furnished
> to me by Pradip Malde mentioned only two-step drying. If that
> recommendation has changed, fine, I'm just not aware of it.

I did not mean to imply not recommended. I made sure to use the words
not required.
It may all be in the way that a question is phrased. I certainly got
the
impression, that it was OK not to dry and rehumidify within the
Ware/Malde
process. This was in direct conversation with Dr. Ware. And I believe
that within working techniques, flexibility is key and not solely
available to AFO/LiPd users.

>
>
> As for even drying with afo/LiPd prints, in fact what can work best is a
> controlled unevenness: a fairly dry surface with a more humid 'resevoir'
> of moisture in the body of the paper.

I would call that even. While the surface may have less, the density of
water/cm2 of paper would be even.

> This is easily achieved with
> one-side cold-air drying. This works great with small and medium size
> prints. With large sheets of paper for negatives over 8x10, one-step
> drying tends to leave an unstable sheet that can be difficult to print
> flat and is more likely to show uneven color across the surface. In this
> case two-step drying can work better. Just as useful though is simply to
> hang the sheet in a controlled humidity (around 60% is good) environment
> for half an hour or so.

Yes, I agree.

> <SNIP>

> But in my experience
> inconsistency and lack of repeatability from print to print is much more
> of a problem with this approach.
>

Even with 45 minutes of hanging out in the box?

>
> I frequently get email from folks asking for trouble-shooting help on
> their first attempts at zia printing. When drying problems--uneven
> color, etc-- occur it usually turns out the person is using two-step
> drying because it seems easier or safer. A switch to one-step generally
> fixes things up.
>

To me, that is an indication that the drying method that they use is
uneven
to begin with, and that they have not given the paper a long enough
period
of time to stabilize to a new humidity. It could very well be that by
eliminating the dry and rehumidify, you are helping them to eliminate a
step
in their process that they don't do so well. It would also be of
interest to
know how they are rehumidify the paper. Are they holding it over a
moisture stream or placing it in a box with adequate circulation and
appropriate humidity.

Cheers
EJ Neilsen

--
Eric J. Neilsen
4101 Commerce Street, Suite #9
Dallas, TX 75226
214-827-8301
http://e.neilsen.home.att.net
http://www.ericneilsenphotography.com


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