A type of ink produced using pigments which can be magnetized after printing so as to enable the printed material to be read using Magnetic Ink Character Recognition equipment, originally developed for use in the electronic processing of bank checks. Magnetic inks must be produced along strict guidelines, and must print clearly, so as to facilitate the reading of the material by machine. Magnetic inks can also contain black pigments produced from magnetite, a naturally-occurring magnetic oxide of iron.
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