Rosemarie Hansen learned the hard way when an open flame turned her locks into a lesson ... basically a big box with a vent slit at the top and bottom. We used Bunsen burners for much of our work ...

For the demonstration in the video below, [F-J] dangled a steel ball from a chain into a Bunsen burner flame and dunked it into 150 ml of room-temperature water. After a nice long toasting ...