What happens when you rotate copper sulfate while it is on fire

What happens when you rotate copper sulfate while it is on fire
This is a great gif because it demonstrates two things :
1.  the fluid dynamics of how the rotation plus the low density of hot fluids forms a twisted column.
2. electrons gaining and losing energy in the copper atoms gives the flame a green color.

Reference:
http://www.chemicalconnection.org.uk/chemistry/topics/view.php?topic=3&headingno=5
Gif via imgur