A stiff or rigid paper stock. Card stock can also be described by pound weights. This coating allows the paper to be printed without significant ink absorption. This lack of absorption assures that the ink doesn't run or spread and cause blurriness or lack of contrast. Color builds are often used for background, text and graphics where it is important that the color remain very consistent over the entire piece.
Crop marks show where a page, photo or transparency is to be cut.
Crop marks determine which sections of a photo or transparency should be reproduced when only part of the original image is desired. Computer based imagesetters create film with dot patterns. Holes for three ring binding are drilled, rather than punched. The standard hole punch used in most offices can only punch a few sheets at a time. However, a specialized drilling machine performs the same function on up to 1000 sheets in a single pass.