Example from The Great Canadian Trivia Book 2 

Q. What can you tell me about a blue $2 bill I have in my currency collection?

A. Most of us probably think the only blue Canadian bill is the $5 bill. However, back in 1935, the $2 bill was blue, for a time at least. The blue two was printed in French and English in 1935 and remained in production until 1937, when the $5 bill of the day changed colours from orange to blue.

In 1937, to avoid confusion, the Bank of Canada changed the blue $2 bill to a terra cotta colour, and it stayed that way until 1996, when it was replaced by the $2 coin, says Graham Esler, curator at the Bank of Canada currency museum in Ottawa.

The blue bill was the first $2 bill ever printed by the Bank of Canada and the first printed in both French and English. There were four blue $2 English bills printed for every French blue $2 bill, and the notes pictured Queen Mary on the front and a transportation allegory on the back including trains, a collage of ships, an airplane and Mercury, the god of speed and commerce.

Ottawa coin and stamp dealer Sean Isaacs estimates the minimum value of an undamaged blue $2 bill at $50 for the English version and $75 for the French one. If you have one in mint condition, he says the English one is worth $550 and the French $1,500. About 27 million blue twos were printed, but Isaacs estimates there are only several hundred still around.