From: Eric Neilsen (e.neilsen@worldnet.att.net)
Date: 04/10/02-09:09:19 AM Z
Yes Carl : ) , this was my point. and might it also be true for other
processes? If a dried paper is humidified after the drying process does it
show the loss of density? As we have seen, at least with pt/pd, humidity
controls color, speed, and contrast with both FO and AFO ingredients. I
would expect other iron processes to show similar results, perhaps, not but
it is important to control the level in a predictable way. I have seen hugh
changes in color with Chrysotypes due to humidity which is another AFO
process.
EJ Neilsen
----- Original Message -----
From: "Carl Weese" <cweese@earthlink.net>
To: <alt-photo-process-l@sask.usask.ca>
Sent: Wednesday, April 10, 2002 4:38 AM
Subject: Re: heat drying Re: Platinum respirator
>
> > I haven't made the test in platinum, but I've made it in VDB and
> > cyanotype, and my students made it repeatedly. (They were required to do
> > two "variables tests" per semester, and this was one of the easiest !).
>
> I have done the testing with Pt/Pd and several papers. Different humidity
> levels make an enormous difference to the tone of platinum prints, but
heat
> dried sheets print exactly the same as those dried without heat as long as
> they are allowed to come back to the same moisture content. There may be
> some papers where this won't hold true, but it holds with commonly used
ones
> like Platine, Crane Cover, Lenox, Rising Bristol...
>
> ---Carl
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