From: Eric Neilsen (e.neilsen@worldnet.att.net)
Date: 04/09/02-07:55:12 PM Z
Bob, Where is your evidence for the heat drying with platinum and reduced
steps? This sounds more like a change in RH and not a heat issue. Changes
in RH can be achieved without heat as well. I have not seen that. I would
suggest that any drying or air movement would take some particles of the
coating solution with it. Platinum has been shown to be associated with
asthmatic condition. Any platinum spill should be cleaned up right away.
As for Pot Ox, I would be more careful of using it warm or heated. If you
use multiple trays, having one with Pot Ox, it should be covered at all
times when practical.
EJ Neilsen
----- Original Message -----
From: "Robert W. Schramm" <schrammrus@hotmail.com>
To: <alt-photo-process-l@sask.usask.ca>
Sent: Tuesday, April 09, 2002 4:03 PM
Subject: Platinum respirator
There is no need for a respirator for platinum printing unless you insist on
heat drying your coated paper. This is a bad idea since little particles can
flake off and drift around the room. Besides, there is evidence that heat
drying will result in the loss of one or more steps (on a 21 step wedge) of
contrast.
I would suggest you wear gloves, however, as the sensitizer can be absorbed
through your skin. Also potassium oxalate developer, if you use it, is toxic
and can also be absorbed through your skin. If you use HCl to clear and you
are working with concentrated acid, don't pour water into acid but I suspect
you learned that in chemistry class. PS latex gloves won't work. Use Nitrel
(sp?) gloves (they are blue).
Bob Schramm
Check out my web page at:
also look at:
http://www.wlsc.wvnet.edu/www/pubrel/photo.html
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