From: Robert W. Schramm (schrammrus@hotmail.com)
Date: 04/18/00-04:54:48 PM Z
Judy et al,
Yes, as I recall the intensity was essentially the same. I did all those
tests when I was considering going to Montana. I've got all
that stuff in a box somewhere in my studio. I aslo recall that the
paper was a big factor. Now that I think of it, one paper was much
faster than the other. I believe it was Crane's Cover stock.
The thing that surprised me most was that 2A to 1 B gave a tonal
range very near that of the Ware process. I was printing the same
negative along with a 21 step tablet. I was going to write a little
summary but never did. You know how it goes. ;-)
Bob
>From: Judy Seigel <jseigel@panix.com>
>Reply-To: alt-photo-process-l@sask.usask.ca
>To: alt-photo-process-l@sask.usask.ca
>Subject: Re: cyanotype sensitivity
>Date: Mon, 17 Apr 2000 17:02:50 -0400 (EDT)
>
>
>
>On Mon, 17 Apr 2000, Gwen Walstrand wrote:
>
> > I neglected to mention in my last message what the actual exposure times
> > for cyanotype are. They are typically one hour (or more) for a film
> > negative and about 50 minutes for an inkjet negative. We may try the sun
> > next. Thanks for your help.
> > Gwen
> >
>
>Gwen, if you're getting exposures of 4 to 8 minutes for VDB, as you say,
>yet nearly 1 hour for cyanotype, something is wrong. My guess would be the
>chemicals. Is your solution yellow-green when mixed? Which formula are you
>using? Distilled water? Is your water very alkaline? Are you using the
>same negatives?
>
>Not that the halide light at 30 inches is best choice... BL fluorescent
>bulbs, as Bob noted, are much more practical -- at distance of 2-3 inches,
>can take several prints at a time, low wattage, low heat, and long life.
>But exposure times for VDB & cyanotype are, with any lighting system I've
>used, within 20% of each other. Maybe you've got some cockamamie paper?
>Try a test of the cyano on a good quality typing paper, or even a paper
>bag, to check that..
>
>And Bob: you say you extended cyano scale by 2 parts A to 1 part B. I did,
>too -- but the color was much lighter. Did you get same intensity?
>
>Judy
>
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