When is a £20 note not worth £20?

When it's a forgery!
Ever since money was first invented, criminals have tried to copy it. But the Bank of England has always tried to come up with ways to stop forgery.
This note dates from two hundred years ago. You can see that it has a very simple design.
Nowadays, the design is much more complicated, making it much more difficult to copy.
There are lots of low-tech ways with which you can tell a real note from a fake one.

Firstly, the feel of the paper...
...the metal thread which runs through the paper...
...the watermark...
...and the raised printing on the surface of the note.
But the Bank of England now uses a more and more high tech methods to prevent notes from being copied.

For the first time in this country, our banknotes now bear a hologram - a picture that's painted on by laser.
The picture changes according to the position of light, making it almost impossible to copy.
As well as the hologram, there are other security features.

Fluorescent ink - which can be seen under ultra-violet lighting - is used, as you can see here.
And see this wavy design on this £10? Looks nice, doesn't it?

It's actually wording.
Under the microscope you can see the type clearly.

So - if this type isn't present on a note, it's not real!
The police estimate that less than 1% of all banknotes in the UK are forged, thanks to all the high-tech anti-forgery devices in use on notes today.

Which is a good thing, because a forged note isn't worth the paper it's written on!
© BBC MMI

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