Re: cyanotype

Hi Gord,

Just potassium ferricyanide alone may not be much good for making prints, but ferric ammonium
citrate can, almost. If ferric ammonium citrate is coated on paper, dried and exposed, a quite good
image can be gotten if the print is then developed in a solution of potassium ferricyanide. No poisonus
gas would form either.

But why would one want to do it with just one ingredient?

Sam

>
> From: "Gordon J. Holtslander" <holtsg@duke.usask.ca>
> Date: 2004/05/28 Fri AM 11:29:32 EDT
> To: alt-photo-process-l@usask.ca
> Subject: cyanotype
>
> Hi:
>
> I have been rereading Mike Ware's Cyanotype book. Lots of interesting
> stuff - but spread through out the book.
>
> Since there is some interest in the difference between the traditional
> cyanotype and Mike Ware's new cyanotype - I tought I would summarize
> things from his book
>
> But not in one posting :)
>
> a cyanotype can be made with pottasium ferricyanide by itself. A 10
> to 16% solution of pottasium ferricyanide ...
>
> "is capable of producing a well-graduated, clean negative-working
> print of a somewhat greenish-blue (23c7 to 23e7), but of rather low
> maximum density"
>
> The exposure time is very long - 1 to 2 hours in bright sunlight.
> Detectable amounts of hydrogen cyanide gas are released during
> exposure - so this should not be done in a confined space.
>
> More later.
>
> Gord
>
>
> ---------------------------------------------------------
> Gordon J. Holtslander Dept. of Biology
> holtsg@duke.usask.ca 112 Science Place
> http://duke.usask.ca/~holtsg University of Saskatchewan
> Tel (306) 966-4433 Saskatoon, Saskatchewan
> Fax (306) 966-4461 Canada S7N 5E2
> ---------------------------------------------------------
>
Received on Fri May 28 19:20:33 2004