A blueprint is a type of paper-based
reproduction usually of a technical
drawing documenting an
architecture or an engineering design. More generally, the term
"blueprint" has come to be used to refer to any detailed plan.
A blueprint had several advantages over other types of drawings; the
contact printing method allowed an unlimited number of prints to be made
without degradation and assured highly accurate dimensions on the copies.
The resulting prints were resistant to fading, marking, and alteration.
Additionally, the blueprint process was significantly less expensive than
a silver-based photographic process.
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Revision control was
done in contrasting color on the blueprints, for example red markup of
a blueprint copy by the engineer, then yellow markup on the copy by
the draftsman who implemented the changes on the original drawing,
then brown markup by the checker, on a check-print (a brown-line) or
sepias. Finally, the architect or engineer, draftsman, checker and
supervisor would sign the original drawing, thus making it a legal
document. This final, approved drawing would become the original from
which new blueprints were made |
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