(pronounced BLU-prihnt)

Until the advent of large-scale xerographic photocopiers in the late 1990s, blueprints were the only way to accurately and rapidly mass-produce hardcopies of design professionals’ construction documents and manufacturers’ mechanical drawings. Blueprint shops would take the drawings executed either with pencil on vellum or ink on Mylar and make a type of photographic contact print on light-sensitive sheets of paper. The result was a negative of the original drawing in shades of blue and white, but as you can see from the photo below, blueprints yellow over age.
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