Question : Why do you need to use MICR toner to print checks?

micr toner

Best answer:

Answer by Shan
MICR characters are printed with a magnetic ink or toner. Magnetic printing is used so that the characters can be reliably read into a system, even when they have been overprinted with other marks such as cancellation stamps. The characters are read with a device similar in nature to the head of an audio tape recorder, and the letterforms’ bulbous shapes insure that each letter produces a unique waveform for the read head.