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Silver halide film

Photographic film in which the light sensitive ingredient is a silver halide emulsion. Properly processed and stored, silver halide film can be considered archival, and should be used for master microform production.

Size ( sizing)

Chemicals added to paper and board during manufacture to make it less absorbent, so that inks will not bleed, and the image will have better definition. Sizing can also be used to strengthen weak papers. Rosins, gelatin, starches and synthetic resins are used as sizing agents. Sizes used in permanent papers are alkaline.

Slipcase

A well fitting open-fronted case into which a book may be slipped or pushed for protection, leaving the spine displayed.

Spine

The back edge of a book; opposite to the fore-edge

Surrogate

A copy of the information content of an original item in another medium, usually one that is more durable. See also reproduction and facsimile.