I'm sure you've seen this pattern on paper notes, and most people have assumed that those are words written in braille.
But that's not the case. It's a high-tech thing, and not just for Chinese paper money, but for many countries in the world. So what are they doing?
In fact, the red circle is called "Anti fake technique of circle constellation ", also known as Ohm ring, and it can achieve an extremely special magical effect, which is to make the copy machine can identify the paper copy and refuse to fulfill.
The technology appeared in 1996, many currencies using the technology, including the dollar, euro and yen.
Some countries' currency, the ohm ring, is a bit like Orion! And indeed, the anti-counterfeiting technology consists of five small circles, five small circles arranged in the form of Orion, forming a complete constellation pattern. And when the scanner or a printer device recognition to this design automatically reject or offset the output, so let criminals cannot simply by commonly used devices to counterfeit money!
There are a lot of similar technologies around us, but we don't pay attention to it, I hope that we can grow more knowledge.