You can get the formula here (from it's inventor):
http://www.mikeware.demon.co.uk/cyano.html
You can buy pre mixed solution here (some of the chemicals are hard to
find):
http://www.bostick-sullivan.com/
As to the needed negative density, it will vary with the paper and
light source you use. More exposure (perhaps 1/2 stop beyond silver)
and more development (perhaps 50% more than silver) is a "starting
point".
On Saturday, May 15, 2004, at 05:10 AM, Thom Mitchell wrote:
> I have a few simple questions. Where can you find the formula for the
> new
> cyanotype? I'll be making in camera negs for the process and I do not
> have a
> densitometer, so how thick or thin should ones negs be to make a decent
> image on cyanotype. Normal exposure and processing? 1 stop
> over-exposed? 2
> stops over-exposed? 1 stop under-exposed? etc. I ask this merely to
> ascertain a starting point from which to begin my own testing and
> possibly
> shorten the cycle of frustration. Thanks, Thom
<SNIP>
--------------
Tom Ferguson
http://www.ferguson-photo-design.com
Received on Sat May 15 08:33:49 2004
This archive was generated by hypermail 2.1.8 : 06/04/04-01:20:53 PM Z CST