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Check your local patent office for more information. The link is the 1949 method used by Canadian and British during World War II.

I feel I need to point out the dangers associated with this information. Don't kill yourself.

Source: http://pubs.acs.org/cgi-bin/abstract.cgi/jacsat/1949/71/i05/f-pdf/f_ja01173a092.pdf

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16y ago

What else can I help you with?