Re: Cyanotype

I mixed up the 40% and tried it:

Single coats:
40% "A" 1:1 Had best dmax, similar to double coating 20%.1:1 Needs a defter
touch when coating. Definately could cause problems if overcoated. Not for
wimps.
20% "A" 1:1 Still had a deep blue, not as deep. Same number speed as above.
20% "A" 2:1 Lightest dmax but acceptable, Faster by about a stop though.

~m

> Question: which leads back to Michael, I think, who asked instead of
using
> 20% FAC 2 parts to 8% potassium ferricyanide 1 part, why not mix a 40%
> solution of FAC and then use that 1:1 with an 8% solution of potassium
> ferricyanide...I wondered if mixing it up that heavily would lead to
> undissolved FAC in solution, if there is a point where FAC falls out of
> suspension....and then might lead to graininess or some such thing. You
say,
> below, you get crystallization on the paper--do you mean white spots,
actual
> crystals, graininess, etc??? Short of just mixing up a 40% and trying it
> myself, which I might do, I'm just wondering if graininess that people
> complain about with the traditional formula has to do with too much
FAC...OR
> even, if the amount of FAC doesn't even matter that much as one person has
> suggested.
>
Received on Thu Feb 16 00:14:02 2006