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The name stems from one of the first practical methods of copying images without simply tracing them by hand. John Herschel invented a way to do it with chemicals in 1842, and the process (called cyanotype) involved turning the paper blue.

You would do your drawing on a very thin piece of cloth or paper and lay it over a piece of regular paper that had been soaked in the key chemicals. Then, after being exposed to bright light, the paper would turn blue—except where the drawing was blocking the light from getting to the paper, leaving those lines white.

The process was extremely popular until Xerographic copies and computers started to take over, but the name stuck. Now, many blueprints are blue in name only.

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Candido Kohler

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5y ago

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