Ok, I guessed good then; it's all to do with the
concentration of tannic acid. Thanks for clarifying.
Will try the concentrations you suggested - because I
really liked the color you've achieved - I it works
with the paper I use (unfortunately we don't have
Waterford here in Istanbul). I want to tone cyanotypes
but not to the extent they look like vandykes - this
is not much logical as it takes considerably more time
than making an ordinary vandyke ;). The sole reason I
can think for toning cyanotypes brown, is to save
costly-to-me negative material by using the same
negative to make both blue and brown prints.
Merci pour votre aide précieuse. J'aime bien vos
tirages.
Amitie,
Loris.
P.S. I see some very nice brown - blue split toned
cyanotypes in alternativephotography.com site; anybody
with a "bulletproof" method for achieving this? (is
the solution bleaching in sodium carbonate?)
--- philippe berger <mineurdecharbon@skynet.be> wrote:
> Sorry, i am no good understand
>
>
http://users.skynet.be/philippe.berger/cyanodemo.html
>
> The bleach is ammoniac à 1%
>
> The color depend of the concentration of the acid
> tannic
> Acid tannic 1% for the reddish cyanotype and Acid
> Tannic 10% for the mauve
> cyanotype
> The time is very long (30 à 60 minutes)
>
> The paper is also important
> I use the Waterford Sanderford
>
> Amitié
>
> Philippe
> http://users.skynet.be/philippe.berger
Received on Tue Mar 30 15:14:15 2004
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