The UK notes have a whole host of countercounterfitting gadgets. Metal strips, watermarks, microprinting, special paper (not as cottony as US bills), holograms.... see here for a full list for each note:
http://www.bankofengland.co.uk/bankn...security_5.htm
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The most difficult thing is the decision to act, the rest is merely tenacity Amelia Earhart
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