facemenu-remove-face-function is a variable defined in `facemenu.el'.
Its value is
nil
This variable may be risky if used as a file-local variable.
Documentation:
When non-nil, this is a function called to remove faces.
This function is passed the START and END of text to change.
May also be t meaning to use `facemenu-add-face-function'.
You can customize this variable.