U of S | Mailing List Archive | alt-photo-process-l | Re: COT 320

Re: COT 320

  • To: alt-photo-process-l@usask.ca
  • Subject: Re: COT 320
  • From: Diana Bloomfield <dhbloomfield@bellsouth.net>
  • Date: Fri, 16 May 2008 01:04:03 -0400
  • Comments: "alt-photo-process mailing list"
  • Delivered-to: alt-photo-process-l-archive@www.usask.ca
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  • Reply-to: alt-photo-process-l@usask.ca

Hi Bob,

I also use varying sizes of COT320, and I've certainly noticed a difference among the paper sizes as well. I always wondered about that. The newer batch I'm working with doesn't seem to have any of the earlier problems mentioned here, about which I'm really happy-- but my recent experience suggests this paper is not as consistently predictable/reliable as it once was. I do wish paper manufacturers would leave well enough alone. :)


On May 15, 2008, at 11:10 PM, BOB KISS wrote:

I hope this might be of interest to someone.
Given the complex formulation of sliver gelatin enlarging paper, I
make certain that I do my test strips from the very box from which I will
take the paper for the final enlargements. There can easily be some
variation of speed and contrast from batch to batch.
However, it never entered my mind that the same could be true of a
paper like COT 320. I bought some 11X14 and, about 6 months later, bought
some 20X24.obviously two different batches. I tried making test strips
using some of the 11X14 paper and, on two occasions, the prints on the 20X24
paper were lighter. Yes EVERYTHING was the same; same drop ratio, same
Magic Brush, same plate burner, same dev, same dev temp.same everything. I
found it hard to believe so I cut up one sheet of 20X24 and made a test
strip. The large print matches, as closely as I can see, the results on the
test strip.
There were none of the other major problems about which I have read
on this list with COT 320.just a difference in speed. Well, this might be
obvious to some but I never thought that different batches of the same
watercolor paper could produce such different results.

Please check my website: http://www.bobkiss.com/

"Live as if you are going to die tomorrow. Learn as if you are going to
live forever". Mahatma Gandhi

  • References:
    • COT 320
      • From: BOB KISS <bobkiss@caribsurf.com>