
MICR stands for, Magnetic Ink Character Recognition, its a special type of ink used by banks on business checks and personal checks so they can read them with a special machine. This ink helps ensure that you are protected and that even if the numbers get smugged the machine can still read them because of the iron oxide in it.There are a few places that this ink is used, it is not on the whole check but just on certain places.
One place that MICR is used is on the account number which is located at the bottom of the check. Another place it can be used is on the banks name to be identified better. A third place is could be is on the amount (which is usually left empty when you purchase the check) to secure that the amount is right and can not be changed.