You can't photocopy this blogpost (abusing EURion in CSS)
Do you know about the EURion constellation? It is a pattern which is embedded into some modern banknotes and has a curious property. Most modern photocopiers will, if they detect the pattern, refuse to make a copy.
Try it for yourself - stick a €20 note into your nearest Xerox machine and try to print out some illicit currency - see what happens!
It goes a little further Some printers will refuse to print anything which contains this pattern. Lots of image editing software will throw up dire warnings if you try to open a file with it embedded.
Now, I know what you're thinking. Usually web browsers won't print background images. Even if you mark them as !important. And don't try using @media print because that won't work either.
Instead, you need to use print-color-adjust: exact; to tell the browser that you want to print exactly what is seen on screen.
If you can print this blog post in colour - and then photocopy it - do please let me know 😉
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So every enterprising kid is now forced to locate an image of a banknote without that pattern, in order to exercise his freedom of the press rights? That is unacceptable gov interference! Why should the central banks be the only ones who can print money at will? That measure will put the European economy behind those of China, Russia, North Korea...
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Xerox VersaLink C7020, no problems whatsoever.
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