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The Short Answer
PicoWay for most people — it's the safest generalist and the only picosecond option that's genuinely safe on Fitzpatrick IV–VI skin. PicoSure if your tattoo has green, teal, or light blue in it, because 755nm is the only wavelength that reliably clears those. Q-Switch if you're on a budget with a simple black tattoo, or you only need fading for a cover-up.
Most clinics advertise laser removal like it's one thing. It isn't — the machine on the other side of the room decides how many sessions you sit through, how much you pay, and whether the green ever leaves at all. The Three Technologies, Briefly Every tattoo laser works the same way. Fire a pulse of light, the ink absorbs it, the ink shatters, your immune system hauls away the fragments. What separates the machines is pulse duration and wavelength. Pulse duration is how long the light hits. Shorter pulses turn the energy into a shockwave instead of heat — the ink shatters mechanically rather than cooking, which means finer fragments and less damage to everything around it.
- Q-Switch: nanosecond pulses — billionths of a second
- PicoSure and PicoWay: picosecond pulses — trillionths, roughly 1,000× shorter Wavelength is which colors the light can see. Ink only breaks if it absorbs the exact wavelength being fired at it. A machine with one wavelength clears one family of inks. That's the whole story. PicoWay — Best for Most People PicoWay runs three wavelengths — 532nm, 785nm, and 1064nm — with the shortest pulse durations on the market, roughly 300 to 450 picoseconds depending on the handpiece. That 1064nm setting is the workhorse for black and dark blue, and it's the safest option available for Fitzpatrick IV–VI skin because longer wavelengths slip past melanin instead of fighting it. What that means in the chair:
- Fewest sessions on professional black work — often 5 to 8 where a Q-Switch needs 10 to 12
- The safest picosecond option for darker skin, and it isn't close
- 532nm clears red and orange cleanly
- 785nm handles blues and greens without the 755nm melanin problem HONEST LIMITATION: PicoWay runs 20 to 40% more per session than Q-Switch, and not every clinic has one. If yours doesn't, they won't mention it exists. And 785nm is a little less aggressive on stubborn greens than PicoSure's 755nm — that's a trade for safety, and for most people it's the right trade. But if you've got saturated green on pale skin, it's a real gap and you should know about it. PicoSure — Best for Blues and Greens PicoSure runs primarily at 755nm — alexandrite — which is the wavelength green and light blue ink absorb best. This is the machine that made green removable in a reasonable number of sessions instead of "maybe, eventually, partially, sorry." Where it wins:
- Green, teal, and light blue — nothing else touches it as reliably
- The 755nm absorption curve for those inks is genuinely superior, not marginally better
- Add-on 532nm and 1064nm handpieces exist, so it's not a one-trick machine HONEST LIMITATION: Melanin drinks 755nm. On Fitzpatrick IV–VI skin that means real risk of hypopigmentation and burns, and any tech worth trusting will refuse to run it hot — which means more sessions at lower fluence, which erases the advantage you paid for. Its 1064nm handpiece also isn't as strong as PicoWay's. So it's a specialist, not a generalist. If your tattoo is all black, you're paying a premium for a wavelength you don't need. Q-Switch — Best for Budget and Simple Black Work The Q-switched Nd:YAG has been the standard since the 1990s and it still works. Nanosecond pulses, 1064nm for black, 532nm for red, available everywhere, and dramatically cheaper per session. Where it makes sense:
- Small amateur or stick-and-poke black tattoos — the ink is shallow and unsaturated, and pico is overkill
- Fading for a cover-up, where you only need 3 to 5 sessions of partial clearance anyway
WHY PULSE DURATION BEATS POWER EVERY TIME
The thing that breaks your ink isn't heat, it's a shockwave. When a laser pulse hits an ink particle faster than that particle can shed heat into the tissue around it, the energy has nowhere to go — so the particle expands violently and fractures from the inside. That window is called thermal relaxation time, and for a tattoo ink particle it's roughly 10 nanoseconds. A Q-Switch pulse at 5 to 10 nanoseconds squeaks inside that window, but barely, and a chunk of the energy still leaks out as heat into your dermis. That leak is your blister, your pain, and your hypopigmentation risk. A picosecond pulse at 400 picoseconds is 20 times shorter than the window — nothing leaks. The particle takes the full hit as mechanical stress and shatters into far smaller pieces. Fragment size is the whole game, because the laser doesn't remove anything. Your macrophages do. These are immune cells that engulf debris and carry it to your lymph nodes, and they have a hard size ceiling — a macrophage can swallow a particle of a few microns and it cannot swallow one much larger. Q-Switch leaves fragments that sit near or above that ceiling, so a lot of the ink gets re-phagocytosed and re-deposited right back where it was, which is exactly why your tattoo looks unchanged at session four. Picosecond fragments land well under the ceiling. Same ink, same immune system, same person — but one machine makes debris your body can actually carry out, and the other makes rubble it keeps dropping.
"Q-Switch does not meaningfully clear green — and if that's your ink, twelve more sessions and $1,800 will teach you that the expensive way."
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Exactly What To Do, Day by Day
IDENTIFY EVERY COLOR IN THE TATTOO
Look at it in daylight, not clinic lighting, and name every pigment including the ones under the black. Green, teal, light blue, yellow, or white change which machine you need before anything else does.
KNOW YOUR FITZPATRICK TYPE BEFORE YOU WALK IN
If you're IV–VI, PicoSure at 755nm is off the table and any clinic that suggests it anyway has told you what you need to know. Say your type out loud at consultation and watch what they do with it.
ASK FOR WAVELENGTHS NOT BRAND NAMES
Make them tell you the actual numbers their device fires — 532, 694, 755, 785, 1064. A tech who can't answer that instantly isn't the tech you want holding the handpiece.
DEMAND A TEST SPOT IF THERE'S ANY WHITE OR FLESH-TONE INK
Titanium dioxide oxidizes to grey-black on the first pulse and it doesn't come back. One test spot in a hidden corner costs you nothing and saves you a permanent smudge.
GET YOUR REAL ESTIMATE AFTER SESSION TWO
Book one session, wait seven weeks, photograph the clearance, then ask for the number. Anyone who commits to a session count before seeing how your immune system responds is guessing.
What To Never Use
Buying a 10-session package at consultation
it's a price point dressed as a prognosis, and it locks you to one device before anyone knows whether that device can clear your ink.
PicoSure at 755nm on Fitzpatrick IV–VI skin
melanin absorbs that wavelength almost as hard as the ink does, so you get hypopigmentation and burns instead of clearance.
Letting a clinic run Q-Switch on green and calling it "slow response"
1064nm and 532nm barely touch green pigment, so it's not slow, it's not happening.
Quitting at session four when fading stalls
the ink is already fragmented and in transit through your lymphatics, and stopping there leaves you a permanent grey ghost that's worse than never starting.
