When people think MICR they usually think TROY.

From TROY:

The acronym MICR stands for Magnetic Ink Character Recognition. This technology uses magnetically chargeable ink or toner to print the numbers and special characters on the bottom of checks or other financial transaction documents.

The numbers usually include the account number from which the money will be drawn,the identification number and the routing and transit of the check for the bank where the account resides. MICR technology is used in the banking industry in many countries because it allows for fast and reliable document processing.

TROY's patented anti-fraud technology forces a bright red stain to appear if chemical alteration of a document is attempted. Available in two variations TROY Security and TROY MICR Toner Secure™ allows users to protect the words and graphics printed. For MICR applications and other financial documents a new generation of TROY MICR Toner, TROYMICR Toner Secure™, is becoming the new benchmark in anti-fraud check printing. For standard applications (i.e. education transcripts, medical records, legal documents, etc.) TROY Security Toner adds a cost-effective new layer of security to your sensitive documents.