RE: Prussian (Berlin) Blue vs Turnbull Blue in Cyanotype

Thanks Judy.

Note that my question was more about the aspect of the two blues. Are they different in tone or stg ?
The idea behind using positive cyanotype is to avoid enlarging negative. Just enlarged "inter"positive would be sufficient in this case.
I'll give feedback to interested people.

Thanks,

Philippe

On Wed, 5 Nov 2003, Monnoyer Philippe wrote:

> Hello,
>
> I'd like to try reversal (positive) cyanotype which gives Prussian Blue (ferric ferrocyanide). Before ordering potassium ferrocyanide I would like to ask you guys how Prussian blue compares to the common (negative) cyanotype Turnbull blue (ferrous ferricyanide).
> Is it colder, deeper, ... ?

I'd imagine if anyone can make this work, Philippe would be it, but even
so it takes a tremendous amount of chemical, far more than "regular"
cyano for the same size print. Plus I never yet did hear of it working, or
anyway not well (which may be worth considering when deciding how much
chemical to buy...)

J.
Received on Thu Nov 6 03:34:50 2003