From: Nick Makris (nick@mcn.org)
Date: 11/02/01-02:10:56 PM Z
Carl, I was hoping to catch your interest, many thanks for the response.
Your concern for the adverse affects of chlorate may be correct in some
circumstances, however consider that on other tests in this series, with
exactly the same parameters except:
One with 0 PC and 0 PT the blacks were somewhat flat.
One with 0 PC and 1 PT the blacks were also somewhat flat.
Also, since my post earlier today, I made another test in which I extended
the exposure to 7.5 minutes without getting any closer to maximum density.
This is somewhat confusing.
I also changed my developer only to find that I now have slower speed in the
sensitiser.
Could my Super Actinic bulbs be going out???? They are about 2 years old
and I probably have made less than 100 prints with them. That might account
for my unanticipated change in density - recall that I wrote:
> For no apparent reason, a specific time I was using was no longer
producing the same density
Thanks again,
Nick
----- Original Message -----
From: "Carl Weese" <cweese@earthlink.net>
To: <alt-photo-process-l@skyway.usask.ca>
Sent: Friday, November 02, 2001 11:27 AM
Subject: Re: Platinum/Paladium testing
> Nick,
>
> Two thoughts. First, that's a huge amount of contrast agent. In general I
> think it's best to make a negative that requires no contrast agent at all,
> but certainly a drop of 4% chlorate in just 13 drops of sensitizer is
really
> over the top.
>
> Second, you may be chasing a phantom looking to print the extremes. It may
> be more realistic to expect your good print density values to result from
> negative densities ranging from (just for instance) 15% to 85%. As long as
> the pictorial information lies within that range a picture should print
> well--assuming those are the density extremes that the paper responds to.
> Certainly my in-camera negatives don't place subject tones anywhere near
> clear film or opaque density--the top and bottom 5% of a digital neg.
>
> ---Carl
> --
> web site with picture galleries
> and workshop information at:
>
> http://home.earthlink.net/~cweese/
>
> ----------
>
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