From: Judy Seigel (jseigel@panix.com)
Date: 01/23/03-05:31:02 PM Z
Christina,
That was actually in fact one reason I started Post-Factory... Shuffling
through files & piles whenever I needed a formula was a pain.. Now I know
where they are, with a table of contents, & lately an index, even.
There may not be as Philippe says, a "right" cyano formula (Bob Schramm
for instance varies his ratios), but there's one that's given in most
sources, those that don't do the oxalic acid anyway. I tested the various
variants. On my papers the "classic", following, was generally the best.
solution A = 20 grams (5 tsp) ferric ammonium citrate in 100 cc distilled
solution B = 8 grams (1-1/4 tsp) postassium ferricyanide in 100 cc
distilled.
Equal parts A&B, mixed at time of use is customary.
Happy blueing...
Judy
On Thu, 23 Jan 2003, Christina Z. Anderson wrote:
> Good morning, group!
> I've checked a bunch of books for the formula for traditional cyanotype, and
> the amount of FAC and pot ferri tend to vary. Am I correct in assuming that
> the greater the amount of FAC, the faster the formula, and the greater
> amount of pot ferri, the more contrasty? Is there one correct formula, and
> if so, what is the best one to use? I am currently using Ware's formula, on
> Japanese paper, and have had some fun results, but thought I would also test
> it against the traditional formula. And, as is usual, I cannot find my
> issue #5 of Post Factory, which is the cyano issue if I'm not mistaken.
> Judy, can you buy a back issue and for how much? I know I lent it to a
> student but of course cannot remember which one. I keep making that
> mistake.
> Chris
>
>
>
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