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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