If you’re going from a dark brown to an ash blonde, your balayage treatment will take two or three separate appointments. If you start with blonde hair, it is possible to do it all in one sitting although for optimal results we recommend building your look over 2-3 visits. This is because when you’re taking hair from dark to light, it can take longer to remove natural or artificial pigment from the hair, and to ensure health and integrity we recommend doing so gradually, so it’s important to take things slow and protect the hair along the way.