14 treatments, 2.5 years, only minor change to tattoo.

Hello, I've been trying to remove a black tattoo from my forearm. I've had 1 Q switch & 13 PicoSure goes over 2.5 years, with little change. It could still pass as the original. All the outlines are in tact, just a bit lighter. I had another black tattoo close to the same spot removed completely by the Q switch in 3 goes. Is it OK it's taking so long or should I look into a different laser? Thanks.

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