The tattoo removal process varies in each person. It depends on how much ink was used and how many layers of ink there are and how deep they are. The Picoway laser removes the ink better and faster than other lasers but every person and every tattoo is different.
Darker ink is easier to remove. Sometimes white can changes colors with the laser and white ink does not go away as easily with laser. If it turns black or darker with the laser then it will be easier to remove of subsequent visits. But yes, a black laser goes...
The 1064nm in Picoway works much better for Indian skin/ darker skin types than the 755nm in Picosure. Since post laser dyspigmentation is much higher in ethnic skin, it is definitely safer to go with the 1064 nm which is available in Picoway, but not with the Picosure.