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A low-cost, low-quality printing process utilizing a 2-ply master sheet that transfers its color to paper via indentations in the master. The master sheet is typed or drawn upon, then affixed to the roller of a duplication machine. An alcohol-based solvent is applied to the master, then blank sheets are rolled through the machine, transferring color from master to sheet. Masters were available in various colors, purple being most common for its slower degradation from light. Spirit duplicated sheets are ephemeral, as the color fades in ultraviolet light and the typically-used, acidic, pulp paper yellows and degrades. Spirit Duplication was used by schools and organizations for expedient publications, was effectively obsolete when the photocopier came into wide use, but experienced a revival with the printing of early Zines and other types of Do-It-Yourself independent publishing.

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