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OTTAWA — Disclosing details of behind-the-scenes discussions about tales of melting banknotes could endanger national security or international relations, says Canada’s central bank.

In response to a formal request from The Canadian Press, the Bank Of Canada released 134 pages of internal records — almost completely blanked out — concerning allegations its new polymer bills melted in the scorching summer sun.

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The bank began issuing $100 polymer banknotes in late 2011, saying they were harder to counterfeit than paper notes and would last much longer.

Unconfirmed reports of cooked currency emerged in July when a Kelowna, B.C., bank teller said she had heard of cases in which several bills had melted together inside a car.

Soon after, Mona Billard of Cambridge, Ont., reported that she had returned eight plastic bills in January, after her son stashed his $800 Christmas bonus in a tin can and hid it near a baseboard heater.