A proof banknote is one that is printed to test the printing plates to see if it is suitable or not for putting into full production.
A reason why a proof banknote may be rejected is the colour is not suitable. Another reason why a proof banknote may be rejected is due to the design itself being unsuitable.
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Famous quotes containing the word proof:
“The moment a man begins to talk about technique that’s proof that he is fresh out of ideas.”
—Raymond Chandler (1888–1959)