Bob, I humidify my papers for 1 hour prior to coating. Cranes "Platinotype"
can handle up to 65% humidity. Arches Platine grains up if the humidity goes
over 60%. I then coat the paper, blow dry until it curls, and then place in a
dry mount press for 4 minutes at 150 degrees. Then it goes back in the humidity
chamber at the same % for 7 minutes.m This gives very even coating with a glass
rod. The humidity in my coating room here in Los Angeles is around 29% right
now.
Hope this helps,
John
"WLSVAX::SCHRAMMR"@wlsc.wvnet.edu wrote:
> The "list" has certainly been quiet lately. Is everyone busy getting ready
> for Y2K? ;-)
>
> I have been attempting to do some platinum printing lately and have been
> having a lot of trouble getting even coating. I could not at first understand
> why I was having problems since I wasn't doing anything different from the
> last session until I realized that the last session was in August. I then
> glanced at my handy-dandy Radio Shack wall thermometer/hygrometer and noted
> that the relative humidity was 29% as compared to over 60% last August. I'm
> going to have to find my humidifier unit and get it going. Has anyone else
> had this problem with platinotype?
>
> Bob Schramm
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