I have had previous laser treatments over a 5 year period, including the Q-laser, and Ruby. These were mostly successful, although there is still green and blue left (albeit faded). I've not had a treatment for several years as I was waiting for a new laser to come onto the market. I've also heard of the Alexandrite laser, as I am specfically looking for a green / blue colour removal. I am also looking to remove another tattoo which is mostly purple / black, would I need another laser for these colours?