Using one color to darken, cover greys, refresh existing color or lighten virgin hair (no bleach service)
Adding hints of lighter or darker pieces using foil application to add depth and contrast.
Freehand hair painting technique that gives a really blended natural look with no harsh or obvious regrowth lines
Airtouch: taking thin sections and blowing the hair so the shorter pieces stay out for natural depth and blend while foiling the the remaining hair in hand.
Doing mix of different color services to give a personalized look.