Half a croissant, on a plate, with a sign in front of it saying '50c'
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Hinged steel notes

print on steel and use it for money
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Metal bank notes can be more secure and last longer if they're in the form of mixed metals and other exotic materials and weigh in at 50 grams each. I picture rectangular bits of steel with hinges to let one or two fit in your wallet.
Voice, May 01 2011

Nitinol http://en.wikipedia...iki/Nickel_titanium
Use a superelastic shape-memory alloy instead of steel. [TomP, May 01 2011]

[link]






       The weight and volume would be an issue. But who uses cash these days anyway? If you must upgrade banknotes, use graphene or something, with an embossed wave-guide paintjob.
neutrinos_shadow, May 01 2011
  

       Rather than a flat sheet of metal, how about a small disk, embossed on each side?
8th of 7, May 01 2011
  

       //Rather than a flat sheet of metal, how about a small disk, embossed on each side?//
That's just crazy talk. Round will never catch on.
AbsintheWithoutLeave, May 01 2011
  

       I don't know about the metal fatiguing properties of Nitinol [link], and neither does Wiki (though it does touch on it), but if you made it out of thin sheets of this, you should be able to fold them as you wish and rather than checking for a watermark, anyone suspicious of your note could heat it up a bit and see if it folds out flat.   

       Wiki states that it is 'exceedingly difficult to make' (is // notation also used for external sources?) so probably isn't as easy as sticking hinges on a steel sheet, so the forgeries would hardly exist. Of course that would make it only any good for high value notes though.
TomP, May 01 2011
  

       I figure we should all just move away from physical money if we want to thwart underground economies.
bob, May 02 2011
  

       I figure we should all just move away from digital money if we want to thwart fraudulent economics.   

       I figure money has to move closer to me.
neelandan, May 02 2011
  

       I can't remember having money.
not_morrison_rm, May 02 2011
  

       Yup, definitely not in Kansas any more…
8th of 7, May 02 2011
  

       //I figure money should move from mints to trees//
I have a mint bush - maybe it will grow into a tree.
AbsintheWithoutLeave, May 03 2011
  

       //Metal bank notes can be more secure and last longer if they're in the form of mixed metals and other exotic materials and weigh in at 50 grams each.// sp: 50.00000000000000 grams   

       Accuracy is always more of a detterent to counterfeit than materials.
4whom, May 03 2011
  

       //I figure money should move from mints to trees.// [21Q...] given enough time and enough bad legislation it will. (where "trees" is colloquiall for marijuana)
4whom, May 03 2011
  

       // sp: 50.00000000000000 grams //   

       Sp: 50 +/- 0.0, please.
8th of 7, May 03 2011
  

       Ah [8th...], you mean 50.0 +/- 0.00000000000000001
4whom, May 03 2011
  

       Please, we're trying to confuse the issue here, and you're not helping.
8th of 7, May 03 2011
  

       I think the simplest way to state it would be 1.60753733 troy oz +/- 6,022,141 atomic mass units (+/- 465.73 MeV/c^2).
ytk, May 03 2011
  

       Specie have permissible tolerances to allow for wear and tear.
pocmloc, May 03 2011
  

       Is that like Rock 'N Roll ?
8th of 7, May 03 2011
  

       Yes, but more depressing.
daseva, May 04 2011
  
      
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