code: def kind(self):
          
          self._verify_crc()
          if 'vertex_colors' in self._data:
              mode = 'vertex'
          elif 'face_colors' in self._data:
              mode = 'face'
          else:
              mode = None
  
          return mode
docs: What color mode has been set.
  
          Returns
          ----------
          mode: 'face', 'vertex', or None