report on cynotype and acid and a chemistry question.

Dear list,
Just a quick note to let you know that after many,
many, many tries with cyanotype and acid, I finally
got it to work!
I used the classic formula, mixed 2a: 1b and added 25
percent of citric acid (Of a 40 percent solution of
citric acid mixed with distilled water). This
combination of chemicals, reduced my printing time,
increased d-max and tonal range. At first I thought
that adding the citric acid will dilute the cyanotype
solution, but it did not seems to affect it. I do
have a question: can I add the citric acid (in
granular form) right to either ferric ammonium citrate
or the potassium ferric cyanide, before I mix them
with distilled water? That way I don't have 3 bottles
of chemicals to mix at different proportions...
But for know, I am very please...now comes the gum
prints.

Thank you so very, very much for your help.
:-)
Carmen

        
                
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Received on Mon Oct 24 16:17:24 2005