From: Tom Ferguson (tomf2468@pipeline.com)
Date: 04/10/02-08:12:41 AM Z
I will agree that heat dried platinum, allowed time to return to normal
humidity (or put in a chamber), is fine. I also have tested and am
convinced. Even with time to humidify my cyanotype was "damaged" by the heat
(flatter and less d-max), gum was virtually destroyed!
-- Tom Ferguson http://www.ferguson-photo-design.com> From: Eric Neilsen <e.neilsen@worldnet.att.net> > Subject: Re: heat drying Re: Platinum respirator > > 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?<BIG SNIP> > > > ----- Original Message ----- > From: "Carl Weese" <cweese@earthlink.net> > 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. <SNIP>
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