In cyanotype, we employ K4Fe(CN)6 and a light-sensitive source of Fe(III), to displace K+ and form insoluble prussian blue. Here instead I added an excess of FeCl3•7H2O as a moisture-sensitive source of Fe(III). Dark shades of green and blue indeed develop initially, but we then proceed to form something else.
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What else do we see?👀🤖
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