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Preservation photocopy is copy made with a high-quality machine that is maintained in good enough condition to produce well-fused images (images that will not smudge or be picked up when a piece of pressure-sensitive tape is touched to the surface). The paper must be permanent/durable (acid free and buffered), and the image must be the same size as the original, and on both sides of the leaf with good registration. When replicating a brittle book, most expert copiers will construct a paper frame to obscure the black lines that would otherwise show around the original page edges and that will center the image on the copy paper. Generally, the photocopy facsimile will be bound using double-fan adhesive techniques with an inside gutter margin of no less than 3.7 centimeters.
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