Blue print

a copy in white lines on a blue ground, of a drawing, plan, tracing, etc., or a positive picture in blue and white, from a negative, produced by photographic printing on peculiarly prepared paper.

blue print

A reproduction of a drawing by means of a contact printing process on light-sensitive paper, producing a negative image consisting of white lines on a blue background; esp. refers to such reproductions of architectural drawings or working drawings used on construction sites.

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