noun
magnetic ink
Technical term for ink containing magnetic particles, used in MICR (Magnetic Ink Character Recognition) for checks and documents.
小切手にはマグネチックインクが使われている。
Magnetic ink is used on checks.
Variant with interpunct; less common in running text but seen in technical contexts.
MICR is the technology that uses magnetic ink; マグネチックインク refers specifically to the ink itself.
Loanword from English 'magnetic ink'.