I KNOW I HAVE SEEN IT IN THE CODE BOOK, JUST CANNOT FIND IT NOW. I AM NOT SURE IF I CAN COLOR CODE WIRE SIZE#6. DOES THE CODE SAY 6 AND LARGER OR LARGE THAN #6 IS ALLOWED TO BE COLORED TAPED FOR IDENTIFACATION OF GROUND, NEUTRALS, ETC.
And keep in mind when re-identifying a grounded neutral conductor it can be only with white tape, not gray. this is a error in the 2002 NEC that will be corrected in the 05 NEC. See 200.6(B).