From: Judy Seigel (jseigel@panix.com)
Date: 12/26/00-12:06:32 AM Z
On Mon, 25 Dec 2000, Jack Fulton wrote:
>
> But, on to other things such as the cyanotype negative. I too thought we
> needed the contrasty neg for the prussian blue prints but in my last go
> round w/the students such a dense and somewhat contrast laden negative
> worked best w/salt prints whereas a somewhat dense but normal contrast neg
> worked best for blueprints.
Jack, you force me to point out that contrast in cyanotype is largely a
factor of the paper -- as explained at great, even exhaustive, length in
Post-Factory #5. Average papers print 7 to 8 or 9 steps on the 21 step,
"contrasty" papers may print as few as 5, and longscale papers as many as
12.
As for brightness or *strength* of the blue, again as noted in cyanotype
Issue #5, double coating "classic" cyano on a good-for-cyano paper seems
to give same density/intensity as "new" cyano, with much stabler emulsion
(it NEVER crashes). What's more, the relatively benign ingredients are
easy to mix & a fraction of the cost.
As noted -- was it only last month? maybe month before -- free
introductory Issue #5 for cost of the postage ($1.50 in US). E-mail
offlist for address/ details.
Judy
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| Judy Seigel, Editor >
| World Journal of Post-Factory Photography > "HOW-TO and WHY"
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| <http://rmp.opusis.com/postfactory/postfactory.html>
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