What is Magnetic ink?
{{no sources|date=February 2022}} '''Magnetic ink''' allows a [[computer]] to read characters even if they have been covered with signatures, cancellation marks, bank stamps, or other marks. MICR lines help facilitate automatic check-clearing when banks send their checks to central processing systems at the end of the day. ==How it is made== A [[ferrofluid]] is used in the manufacturing of the magnetic ink. A ferrofluid consists of colloidal particles (nanoscale) composed of iron(II) and iron(III) compounds such as FeCl2 and FeCl3. A ferrofluid is attracted by a [[magnetic field]] but does not become permanently magnetized. {{tech-stub}} [[Category:Data input]]