Blue pencil (editing)
The colour is used specifically because it will not show in some lithographic or photographic reproduction processes; these are known as non-photo blue pencils. For similar reasons, sometimes red pencils are used since their pigment will not reproduce by xerography.
The "blue pencil test" is used by courts of law as a method for deciding whether contractual obligations can be partially enforced.
Blue pencil is also used pejoratively to mean censorship.
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- Johnston, John (30 August 1990), The Lord Chamberlain's Blue Pencil, Hodder & Stoughton, ISBN 978-0-340-52529-6