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intaglio printing - A technique in which the areas to be printed are cut into a plate, so that when the plate is inked and then wiped, the depressed areas will retain the ink.

interleaves - Blank leaves that alternate with the printed leaves of a book, or are placed between prints to separate and reduce contamination from adjacent prints.

iron gall ink - This damage occurs when iron-gall ink, which is acidic, attacks the paper in the center of the pen-strokes where it is concentrated and destroys the paper under the ink. From the fifteenth century onward it was a popular writing and drawing ink. Iron gall ink passed out of use by the early twentieth century.