Overview

Tattoo ink is permanent by design. The pigment particles are deposited in the dermis by the tattooing process at a size too large for the immune system's macrophages to engulf and clear — which is why they remain in place indefinitely under normal conditions. The skin around them heals; the ink stays. What makes laser tattoo removal possible is the same principle that makes all laser treatment work: selective photothermolysis. A laser pulse at the correct wavelength is selectively absorbed by the ink particles — heating them rapidly to the point of thermal expansion and fracture, or in the case of picosecond pulses, shattering them through photoacoustic shockwave — producing ink fragments small enough for macrophages to finally engulf and transport to the lymphatic system for clearance.

The process is not instant, and it is not always complete — and both of these facts deserve to be stated clearly at the outset. The ink must be fragmented across multiple sessions, because the total ink volume in a professional tattoo far exceeds what can be cleared in a single laser exposure. The cleared ink fragments must then be transported and eliminated by the lymphatic system — a biological process that takes weeks between sessions and is the reason that sessions cannot be scheduled too closely together. And some inks — particularly light blues, turquoises, and yellows — absorb laser energy less efficiently than dark inks, and may require more sessions to achieve the same degree of clearance, or may resist complete elimination even after a full treatment course.

At Ministry of Skin, we discuss all of this at the initial consultation. We assess your specific tattoo — the ink colours present, the density of the deposit, the age and style of the work, the anatomical location — and we provide an honest estimate of the number of sessions likely to be required and the degree of clearance that is realistically achievable. We do not promise results that the technology and the ink composition do not support. We do promise to deliver every session with the precision, the appropriate parameters, and the clinical care that gives your tattoo the best possible chance of clearing to the maximum extent achievable.

What Tattoo Removal Actually Does

When a laser pulse of the appropriate wavelength and duration strikes an ink particle, it deposits its energy into the particle faster than the particle can dissipate that energy as heat — causing the particle to expand rapidly and shatter. In Q-Switch nanosecond mode, this shattering is primarily photothermal: the rapid heating and thermal expansion fractures the particle into smaller fragments. In picosecond mode, the pulse is delivered so rapidly — one trillionth of a second — that the thermal expansion occurs before significant heat transfer to the surrounding tissue, producing a photoacoustic shockwave that shatters the particle mechanically into significantly smaller fragments with less thermal collateral effect. The smaller the fragments produced, the more efficiently they can be cleared by macrophages — which is why picosecond mode is generally more effective per session and safer for the surrounding tissue than nanosecond mode alone.

The Fotona Starwalker at Ministry of Skin offers both picosecond and Q-Switch nanosecond delivery across two wavelengths — 1064nm Nd:YAG and 532nm KTP — within the same platform. This is clinically significant because different ink colours absorb different wavelengths most efficiently: dark black and blue inks absorb the 1064nm wavelength most effectively; red, orange, and pink inks absorb the 532nm KTP wavelength; and some stubborn ink colours respond better to nanosecond than picosecond delivery or vice versa. The ability to select and switch between delivery modes and wavelengths across the same session allows our dermatologists to optimise each exposure for the specific composition of the tattoo being treated, rather than applying a single approach to all ink colours equally.