Question

what type of special ink is used on U.S. currency?

Answer 1

Color-changing inks

One of the most common inks in currency is called optically variable color-changing ink. The ink reflects different parts of the white light spectrum depending on the angle from which it is viewed, which results in the appearance of different colors.

This ink is used regularly on higher denominations of banknotes, including US and euro notes. It is not widely manufactured, which makes it harder to acquire, and it cannot be accurately photocopied, as copiers will only reproduce the ink from one angle.

Magnetic ink

Magnetic ink is mostly used on personal checks. The ink contains a magnetic material like iron oxide, and it is used on the routing and account numbers on the bottom of checks in a system called MICR or magnetic ink character recognition. In MICR, the numbers are passed over an MICR read head, and each character produces a different wavelength that the reader can easily interpret.

Unlike the other inks used in currency, this ink is used more for convenience because computers can read and interpret the characters quickly and the processing of checks becomes faster and more accurate. It does have some security features; however, like color-changing inks, it cannot be easily reproduced using a copier, since copier toner doesn’t usually include magnetic ink.

Fluorescent dye

Fluorescent dye can show up in regular light, but there are some dyes that only fluoresce, or glow, under special lighting. This dye can mark higher denominations, and it can help stores, banks and other institutions identify counterfeit money. Cashiers or tellers hold the banknote up to a black light, and real money will have pictures, words or numbers that glow under the light but are invisible in normal conditions.

These are just a few of the security measures that governments take to make sure it is as difficult as possible to pass counterfeit money off as the real deal. Many other measures include putting in plastic strips, microprinting and watermarks, and though these measures do help, nothing prevents counterfeiting with as much flair and creativity as the ink used in currency.

Answer 2

a wee bit long :O

Answer 3

Looks like fluorescent dye since it would stop counterfeiting and explains why cashiers hold it up towards the light to see if it is or not. :)

Answer 4

thank you :) that is very interesting :)

Answer 5

@csscgirl You welcome! It is interesting though. ^_^

Answer 6

@xionfairy thanks for medal :)

Answer 7

@csscgirl You welcome! :'D it's nice to return one, so i always do it!