RE: Humidity and Sensitivity... Platinum and so on...

Ray, Heat and Humidity are ALWAYS important throughout the process. That
being said, it is not always critical nor does it remain the same issue at
each phase of the print production process. The paper will get treated by
the practitioner before the coating of the sensitizer, gum, sizing, et la.
The coated paper is then handled carefully to the next step, and so on until
the finished print lay on the table with the eyes of its creator lovingly
looking down upon it. With the platinum/palladium family of print making,
humidity affects the way the coating solution is absorbed and thus how much
or how little solution to use. In the drying of the paper, it
allows/prevents the penetration of the solution. In the exposure it plays a
roll in speed, color and contrast.

AS you print, you begin to see how critical control of humidity and heat
become. This understanding and others like it can allow you to control the
process rather than it controlling you.

Have fun!

Eric Neilsen Photography
4101 Commerce Street
Suite 9
Dallas, TX 75226
http://e.neilsen.home.att.net
http://ericneilsenphotography.com
 

> -----Original Message-----
> From: Bill William [mailto:iodideshi@yahoo.co.jp]
> Sent: Thursday, August 05, 2004 7:40 AM
> To: alt-photo-process-l@sask.usask.ca
> Subject: Humidity and Sensitivity... Platinium and so on...
>
> (Did I just send that after only changing the subject
> line? If so... Sorry!)
>
> I have often noticed comments relating humidity (RH) and
> sensitivity of alternative processes discussed here on the
> list. Not having much experience, or need in this area, (I
> am working on silver halide emulsions) I never gave it
> much thought. Things have changed. I am sure if I looked
> long enough I could find it somewhere, but to save time
> could someone tell me at what point in time (that is in
> the birth of a print) is humidity an issue?
>
> I am not specifying a process since I assume it will be
> very similar. If not, please explain.
>
> Is it at the moment of exposure?
> or is the Drying Pattern History?
> or during the Final Processing?
>
> It may well be that someone will say yes to all three, in
> which case I would ask, in that case...
>
> Are the effects reversible? Can the effects of RH at one
> stage be compensated for by its effect at another?
>
> Thanks for your patience,
>
> Ray
>
>
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Received on Thu Aug 5 08:45:12 2004