Why Are Blueprints Blue? [Factoid]

If you ever wondered why blueprints were blue and not black or red or white or brown or any other color than blue, well, it's not because architects really like the color but because the technique in making blueprints caused the paper to turn blue. More »

Source: http://feeds.gawker.com/~r/gizmodo/full/~3/PA0o8bw_lyw/why-are-blueprints-blue

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