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Why Blueprints are Blue Making copies of architectural drawings hasnt always been the easiest thing in the world to do. For the majority of human history, the most economical solution was simply to have someone make a tracing of the original plans. In the mid-nineteenth century, the process abruptly became much quicker and easier thanks to famed polymath Sir John Herschel. In 1842, Herschel invented a method to easily copy drawings using potassium ferrocyanide and ammonium iron citrate. The exact method, called cyanotype, is performed as follows. First, you take a drawing of the plans done on relatively translucent tracing paper or cloth and place it on top of and attach it to paper (or sometimes linen, Mylar, etc.) that has been previously soaked in a mixture of the aforementioned two chemicals, then dried. Next, you expose the papers to a bright ultra-violet light source, such as the Sun, for several minutes. The result is that the paper soaked in the chemicals ends up turning blue
