This is a little experiment that I tried recently as I have been toning some prints without the step of bleaching. I have taken a liking to this, the Prussian Blue rendering deeper in tone when compared to prints that were bleached prior to toning. This is a print that was toned in tea and I wanted to see if I could lessen the staining on the white areas of the print.
Coffee toned prints seem to be much easier to bleach out and this can be done with a simple solution of either baking soda and/or washing soda, (which I prefer to use over white vinegar).
With this technique, I found the tea toned prints to be quite stubborn, having to repeat passes of bleach before change began to show. I used vinegar for this print as it seemed to work more effectively.
There are a few variables to think about such as; the type of tea/coffee being used, the concentration of the tea/coffee, the type of paper being used as well as the length of toning that has been applied.
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Selectively Bleaching A Cyanotype Print
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