This formula is courtesy of Richard Farber's book Historic Photographic
Processes
I highly recommend this book for any interested in early 19th century
processes. I would like to scan in the images out of this book to let you
see for yourself but that would be copyright infringement.
However I have a big bottle of tannic acid (powder) and am going to try the
process when I get my obligatory work out of the way.
Sincerely,
Jonathan
P.S. The examples in the book are beautiful. One on fabric.
----- Original Message -----
From: "garimo" <omirag@cruzio.com>
To: <alt-photo-process-l@skyway.usask.ca>;
<alt-photo-process-l@skyway.usask.ca>
Sent: Wednesday, December 08, 1999 8:38 PM
Subject: Re: Toning Cyanotype Brown
> Hi Jonathan!
> Have you tried this formula? What shades have you acheived? Do you
> have any prints scanned that I could look at? Did you have tannic acid
> stains in the paper fibers?
> Just a boy and his questions...thanks,
> Garimo
>
> >For those of you interested in toning cyanotype brown here is an
excellent
> >method.
> >
> >Prepare an aqueous solution (part A) as follows:
> >Ammonia 10ml
> >Water 1000ml
> >
> >Prepare an Aqueous solution (part B) as follows:
> >Tannic acid 20-50grams
> >Water 1000ml
> >
> >Put the cyanotype in solution A untill the blue color is completely
> >bleached.
> >
> >After the cyanotype has bleached away put it into the tannicc acid
solution
> >till it reaches the desired density.
> >
> >Notes: Print cyanotype darker than desired as there is loss of some
density
> >from the bleach bath.
> >Also woth note, there can be some staining of the paper and hightlights
but
> >can partly be avoided by not toning heavily.
> >
> >Have fun
> >
> > Sincerely,
> > Jonathan
> >
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