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Warm and Fussy
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Bank notes to have some small holes in them depending on what they are .. say a '5' having a couple of horizonal small grooves cut into it .. a '10' having a small square cut into it (somewhere), etc.
So when you're reaching into your pocket, once used to it .. you can grab the note you're after
without having to visually check.
Already done with coins. Should be done with notes. Alternatively you could choose different styles of serrated edge on the notes. (Did I use the right word just then?).
This is nothing to do with anti-fraud. No automated machines would use them .. it just lets you quickly dip into your pocket and find the '50$' note rather then any of the mass of 10$ notes you have .. without having to yank them all out in public and start nosing publically through your wad of cash -- both time consuming and a security risk if in a crowded place.
||UK banknotes are all different sizes so it's easier to tell which is which. They also have a different embossed shape on each, to help the partially sighted and blind. I'm all out of notes today so I can't check but I think £5 is a triangle and £10 a square. I never have £20 or £50 for long enough to check!
||We have little clear plastic windows on our notes and I think it would be easy to feel the shape of those, there could be a possibility there.
||// Why the whole world isn't using Australian polymer banknote technology, I have no idea // quite agree, I think they're a real step forward. Not easily destroyed by washing machines ...