spirit duplicating

spirit duplicating

[′spir·ət ′dü·plə‚kād·iŋ]
(graphic arts)
A contact process used in reproducing maps in which a map with several colors in accurate position relative to each other can be produced in one run through the machine; the map is drawn on a paper master having a carbon backing; different-colored carbons can be substituted to prepare a multicolor image.
References in periodicals archive ?
Part 3 contains three spirit duplicating masters of the circular flows model.