Euhm, well as far as I know the Native Americans used grey sage where the romans used white sage. It is supposed to have healing qualities but the grey one is supposed to be more effective at healing certain things than the white one is.
I preffer using white myself.
Be sure to charge after!
"If you take a copy of the Christian Bible and put it out in the wind and the rain,
soon the paper on which the words are printed will disintegrate and the words will be gone.
Our bible IS the wind and the rain."