The title refers to the now very old Ivory Soap claim of 99 and 64/100% Pure - and there is another "old" meaning for 'pure' that would be known to Frankenheimer and Dillon. It's another word for the material tanners would use in browning leather - dog turds. This should have been a clue to the humor to follow.
This is an interesting and odd film.
This is an interesting and odd film.