She first makes a negative print on film from the original digital photo and then makes a contact print using the cyanotype process. If she wants a sepia print she then uses a taking bath which fixes and changes the colour.
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Originally Posted by Genevieve
After making the initial blue print and allowing it to dry and season you bleach it using a weak sodium carbonate solution. Then wash it and put it in a tannin bath to tone. The tannin binds to the iron and causes the colour change. Depending on the source of tannin you get different results, particularly as something like tea will stain the paper quite deeply.

It's an intuitive experimental process where you know the chemistry will do a certain thing but at the same time the outcome isn't guaranteed.

I love it because it injects chance into the very controlled technology of digital photography.
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Peter

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