You have seen the photos: old scalp tattoos that have faded to a murky blue-green, looking nothing like real hair follicles. It is a completely understandable fear, and it is the first thing many people raise when considering scalp micropigmentation. This article explains exactly why that discolouration happens, why modern SMP pigments behave differently, and what you should look for to make sure your result stays looking natural for years.
Why old scalp tattoos turned blue or green
The horror stories you have seen are real, but they are not SMP stories. They are traditional tattooing stories. Conventional tattoo inks are formulated for decorative body art. They contain a mix of organic dyes, metallic salts, and carrier chemicals designed to hold vibrant colour in the dermis for decades. When those inks are placed in the scalp and exposed to UV light, the skin’s natural processes, and the passage of time, the colour compounds break down unevenly. Blues, greens, and even purples emerge because the red and yellow pigment molecules degrade faster than the blue and green ones, leaving a residual cast.
Scalp skin also has a particular characteristic that makes this worse. It is thinner than the skin on your arm or back, and it sits over a rich blood supply. When a traditional tattoo needle drives ink too deep into scalp tissue, the pigment migrates and spreads. A dot placed to mimic a follicle bleeds out into a blob, and as that blob fades unevenly, the green or blue shift becomes impossible to hide.
The result is not a sign that all scalp pigmentation is risky. It is a sign that the wrong product was used, at the wrong depth, by a practitioner who was not trained specifically in scalp micropigmentation.
What makes SMP pigments fundamentally different
Genuine SMP pigments are not tattoo inks. They are purpose-formulated for the scalp, and the chemistry is meaningfully different. The pigments used in quality SMP are predominantly carbon-based, with a much simpler molecular structure than decorative tattoo inks. That simpler structure is not a weakness; it is the entire point. When carbon-based SMP pigment breaks down over time, it fades towards a lighter grey. It does not shift hue. It stays within the same grey-to-black tonal family it started in, which is precisely the family that real hair follicles sit in.
This is why pigment selection should be treated as a clinical decision, not merely an aesthetic preference. A client with very dark brown hair requires a different pigment blend from a client with salt-and-pepper colouring, and getting that match right from the outset protects the result long-term.
Implantation depth matters just as much as pigment chemistry. SMP is placed in the upper dermis, shallower than a traditional tattoo. At that depth, the pigment sits where it can be seen clearly as a small, defined dot, yet close enough to the surface to fade gracefully rather than migrate and spread. Deeper placement, which occurs when a practitioner applies tattoo technique instead of SMP technique, is one of the direct causes of the colour shifts clients fear.
How SMP actually changes over the years
SMP is not permanent in the same way a traditional tattoo is, and that is a deliberate feature, not a flaw. Over three to five years, the pigment gradually lightens. The dots may become slightly less defined, and the overall tone shifts from a deeper grey-black towards a softer mid-grey. At no point in that process does the colour family change. You will not wake up one morning and notice a blue tint at your hairline.
What you will eventually notice is that the result benefits from refreshing. That is what a top-up session is for. A top-up is a single session that restores the original depth and density of the pigment dots, returning the result to its fresh appearance. Most clients return for a top-up somewhere between three and six years after their initial treatment, depending on their skin type, sun exposure, and lifestyle.
The initial treatment itself always involves three sessions, regardless of the extent of hair loss. Those three sessions build the result in layers, allowing the pigment to settle correctly and giving the practitioner the opportunity to refine density and tone at each stage. Compressing treatment into fewer sessions compromises both the immediate result and its long-term stability.
For context on what the full treatment commitment involves, including whether SMP is a permanent or semi-permanent solution, our article on whether a hair tattoo is permanent covers the longevity question in detail.
What genuinely protects your result from colour shift
Three factors determine whether an SMP result ages cleanly: the pigment used, the depth of implantation, and the skill of the practitioner. All three are interconnected. A practitioner who truly specialises in SMP, rather than someone who has added it as a side offering to a general tattooing practice, will use pigments formulated for the scalp, calibrate depth precisely for scalp tissue, and have the clinical experience to adjust technique for different skin types.
Sun exposure is the one lifestyle variable that most accelerates fading. UV light breaks down pigment faster than anything else. Clients who spend significant time outdoors without head protection will find their SMP fades more quickly, though again it fades lighter rather than changing colour. Wearing a quality sunscreen or a hat is genuinely useful advice, not merely a disclaimer.
Skin type also plays a role. Oily skin tends to process pigment slightly faster than dry skin, which is one reason why the top-up timeline varies between clients. An experienced practitioner accounts for this at consultation and sets realistic expectations around longevity from the outset.
If you are weighing up SMP and the colour-shift question is one of the things holding you back, the most useful next step is a conversation with a practitioner who can show you long-term results across different skin types and hair colours, so you can make a genuinely informed decision.
Frequently Asked Questions
Does SMP turn blue or green over time?
Quality SMP does not turn blue or green. Specialised carbon-based scalp pigments are formulated to fade within the grey and black colour family, not shift hue. The blue-green discolouration people fear comes from traditional tattoo inks placed at the wrong depth, a completely different product from genuine SMP pigment, and not a risk when treatment is performed correctly.
Why did old scalp tattoos turn blue or green?
Old scalp tattoos used conventional decorative tattoo inks, which contain organic dyes and metallic compounds that degrade unevenly over time. UV exposure and skin biology break down red and yellow pigment molecules faster than blue and green ones, leaving a colour shift behind. SMP pigments have a simpler molecular structure designed to avoid this; they fade lighter, not greener.
How long does SMP pigment last before it needs a top-up?
Most clients find their SMP result remains strong for three to six years before a top-up is needed. The exact timeline depends on skin type, sun exposure, and lifestyle. Oily skin and high UV exposure accelerate fading. When the result does fade, it lightens gracefully within the same grey tonal family, and a top-up session then restores depth and definition.
How many SMP sessions are required for a full result?
Three sessions are required for a complete SMP result, regardless of the extent of hair loss. The sessions build the result in layers, allowing pigment to settle and giving the practitioner the opportunity to refine tone and density at each stage. Compressing treatment into fewer sessions risks uneven pigment placement and undermines the long-term stability of the result.
What pigment depth is used in SMP and why does it matter?
SMP pigment is placed in the upper dermis, shallower than a conventional tattoo. This precise depth keeps each dot small and defined, replicating the appearance of a real follicle. It also means the pigment fades gracefully rather than migrating and spreading. Incorrect depth, specifically too deep, is one of the main reasons scalp pigmentation can look unnatural or develop unwanted colour shifts over time.
Ready to talk it through?
Foli Sim in Perth offers a personal consultation to answer your questions and recommend the right approach for you. Get in touch with Foli Sim to book your consultation.
