Knock Outs: Masking out or removing text or images so that they do not print or overlap on the final product. For example, white text on a black background will not be printed on white paper and that is referred to as knock out.
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Block outs
Block Outs: Any portion of a file or artwork that will not be printed. For example, on carbonless forms, block outs can be used so that any credit card information that is written on the first sheet will not transfer to the other sheets.