From: Stephen Dell (sdell@fcb.com)
Date: 11/25/00-02:41:51 AM Z
I had fantastic luck salvaging lots of my cyanotypes that were too dark by
toning them with tannic acid. You have to bleach them out first with
ammonia, then redevelop them with the tannic acid. (lots of work and very
time consuming) Each one came out somewhat different color-wise, from a
more metallic blue, to purple to black and even varying shades of brown.
I got the info on how to do it from Boston & Sullivan.
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