If your trying to knock out colour then read the wikipdia here, if not any laser will knock black out, you get Ruby, Alexandrite and YAG.Tattoo removal - Wikipedia, the free encyclopedia
i today have just driven a 2hour round trip to go somewhere that has all 3 lasers. Went over it today with two lasers for each colour and then over the lot again with the yag to knock the black out, it hurt a bit..:p my arm is now blistered and twice the size it should be, oh the fun of laser. Before it was just a standard pass with a yag so i will report back if the results are noticeable better.
today was my 4th session, i reckon ill need 6 so the total will be about £700 with a year of laser plus a 6month rest before the cover up, you need to be motivated to do it.
edit; oh yea the guy i went today with all the gear had the blow air cooling thingy, that soothed and helped a lot.