Plans for the residency developing well

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I have made use of Prussian Blue a lot already in my cyanotypes - it is the same chemistry - and I was delighted to find that Hokusai was the artist who introduced this colour into his woodblock prints in the 1830's and it became one of his signature colours. In my digital prints, 36 Views of Wylfa, I am not using the same chemistry but hope that some of my blues will reference this connection. Challenge - to find an equivalent for Prussian blue in the spectrum.
My interest in Prussian blue stems from thinking about the way cyanotype chemistry was used in the clean-up after the Chernobyl disaster - it helps to neutralise the Caesium 137 in the radioactive fallout.