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in a previous video I made some nice Prussian blue pigment and I showed how it can be used to color things like paint this time though Im gonna be exploring a more specialized used for it which is in a process called cyanotype in this process the Prussian blue is formed directly in paper and was classically used to make blue prints over the years many different formulations were used and developed but the most popular one uses potassium ferrocyanide and a UV sensitive iron compound called ferric ammonium citrate as far as I know theres no safe and reasonable way to make the ferrocyanide so I ended up just buying it from eBay it was possible to make the ferric ammonium citrate though starting from the ferric chloride that I made in the last video it was honestly really hard to find a procedure for this and the only decent one I found was from the 1950s I ended up down scaling it and altering a couple things but in my opinion it still worked out really well Ive included a link to the
