From: Jeffrey D. Mathias (jeffrey.d.mathias@worldnet.att.net)
Date: 01/21/02-01:40:41 PM Z
Carl Weese wrote:
> ... I figure you _must_ be
> warming your metal solutions to keep them fully dissolved,...
That is correct. The metal salt solutions are kept in a warm water
filled container (coffee warmer). The are warm enough to keep in
solution. The sensitizer stays in solution at the concentration I use
at working temperature. When mixed their temperature changes, but the
metals are also now more dilute. I am sure too low a temperature (like
below 50F) could have adverse effects with the solutions, but it would
be also uncomfortable to work as well. But the paper temperature is
most critical. Cooler allows the coating mixture to go on much easier
and smoother. I have always had better success when the ambient
temperature is less than 68F and have been monitoring the temperature
for each coating for about 6 years. It is very much better to humidify
paper with a sonic mister than by steam or hot water vapor.
When printing, the actual temperature is also different than ambient
because of the light warming things up. But the ambient (starting and
base conditions) still provide repeatable results. Cooler being
better. This is also why the printing frame should be allowed to cool
back to ambient each time.
The results are from evaluating prints which had their temperature
monitored and recorded. For each print I record the coating mixture
information, paper or substrate, temp, RH, date, time, illumination
(source and distance), printing time, manipulations, developer, clearing
info, and miscellaneous info or any deviations from typical technique
and procedure when needed.
-- Jeffrey D. Mathias http://home.att.net/~jeffrey.d.mathias/
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