Of the last 3 versions of the $20 bill, (the current ones we can call
rainbow) which would be the most toxic in the following scenario:

10 of each bill are ground up in a blender with a little water.  If 3
different humans were to each ingest one sample solution which one
would be the most toxic?

In the absence of hard chemical evidence a google style educated guess
based on some kind of findings will suffice for payment.  There is a
rumor out there that one of these bills is ?real bad?  This may square
with an old testament account of ?devouring money?.

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Clarification of Question by mcisencraft-ga on 05 Jun 2004 22:13 PDT

ONLY THE LAST TWO  (2) VERSIONS OF THE $20 BILL NEED TO BE COMPAIRED. 
Not the last 3 versions mentioned above.

You could test it on lab animals.