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Book 21, Question 120 · Video

Why Is Some Money Printed with Magnetic Ink?

Video · 1:48 · Crafty Clover explains, from A Million Whys Book 21

Some paper money and bank checks have a secret ingredient in their ink: tiny magnetic particles! You cannot see the magnetism, but machines can sense it.

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What Crafty Clover says in this video

Intro

Hi there, curious minds! I'm Crafty Clover! Let's discover something amazing. Why is some money printed with magnetic ink?

The Big Idea

Some paper money and bank checks have a secret ingredient in their ink: tiny magnetic particles! You cannot see the magnetism, but machines can sense it. Let's find out why money has a magnetic secret.

Ink With Magnets

Step one: ink with magnets. Some paper money and bank checks have numbers or designs printed with ink that contains tiny magnetic particles. People cannot see the magnetism, but a machine can sense it.

Machines Read It

Step two: machines read it. Machines in banks can read these patterns quickly. They can tell if the money or check is real.

Hard to Copy

Step three: hard to copy. Because the ink is hard to copy, it helps stop fakes. Special numbers along the bottom edge of many bank checks are read this way.

A Closer Look

Let's take a closer look! The ink has tiny magnetic bits. A bank machine senses them. It decides if the check is real. Fakes have a hard time copying it.

Quick Facts

Quick facts! Many bank checks have special numbers along the bottom edge that machines read. Machines read them very fast. People cannot see the magnetism. The ink is hard to copy.

Think Like a Scientist

Now, think like a scientist! Look at a bank check or a bill with a grown-up. Find the small numbers along the bottom. Draw the patterns. Compare two different checks. Tell a grown-up what you discover!

Outro

Magnetic ink helps machines tell real money and checks from fakes. Science is amazing! Keep wondering and keep exploring! Crafty Clover can be found on Amazon Books, Google Bookstore, and Apple Books. Available for purchase or download! Bye for now!

Why I wrote this