Factual error: Charlie Chan claims that mixing hydrochloric acid with ferrocyanide of potassium is mixing two acids. Ferrocyanide of potassium is not an acid. (00:27:00)
Charlie Chan at the Opera (1936)
1 factual error
Directed by: H. Bruce Humberstone
Starring: Boris Karloff, Keye Luke, Charlotte Henry, Warner Oland
Factual error: Charlie Chan claims that mixing hydrochloric acid with ferrocyanide of potassium is mixing two acids. Ferrocyanide of potassium is not an acid. (00:27:00)
Charlie Chan: Honorable father once say, "Politeness golden key that open many doors."