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 00:16:21 2003
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