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From Wikipedia

Berlin green (plural Berlin greens)

  1. Ferric ferricyanide; a complex cyanide with a structure similar to that of Prussian blue, used as a green dye.
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12y ago

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Sun print paper is coated with a light-sensitive emulsion that typically contains a combination of ferric ammonium citrate and potassium ferricyanide. When exposed to sunlight, these chemicals undergo a reaction that leads to the paper changing color and creating the cyanotype print.

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9mo ago
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Q: What chemicals are on sun print paper?
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