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The spirit process, also known as the direct or fluid process, is a method of printing used for duplication. In this method, a master copy is created using a typewriter, handwriting, or computer printing. This master sheet is then attached to a rotating drum on a printing machine. As blank sheets of paper, slightly moistened with a special fluid, come into contact with the master sheet, a small amount of ink is transferred, creating a duplicate copy. This process allows for multicolour duplication in a single operation and can produce up to 300 copies from one master sheet.12

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  1. spirit duplicating
  2. hectograph

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