The Truth About the Tyndall Effect, Hybrid Pigments, and Carbon Buildup

Why Permanent Makeup Turns Gray or Blue: The Truth About the Tyndall Effect, Carbon Pigments, and Hybrid PMU Pigments

Permanent makeup has become one of the fastest-growing sectors of the beauty industry. Procedures like microblading, powder brows, and nano brows promise long-lasting results that enhance natural features and simplify daily routines.

However, many permanent makeup clients eventually notice an unexpected problem:

Their brows begin turning gray, ashy, or even slightly blue.

This issue often appears months—or even years—after the initial procedure, leaving clients confused and artists searching for answers.

Within the industry, the explanation most commonly given is something called the Tyndall Effect. But when we examine the science of pigment chemistry, particle size, and how pigments behave in the skin, it becomes clear that the Tyndall Effect does not explain most cases of ashy permanent makeup.

The real causes are far more complex—and they largely involve pigment composition, hybrid pigments, and carbon-based formulations.

Understanding these factors is critical for both permanent makeup artists and clients who want results that age beautifully over time.

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What Is the Tyndall Effect in Permanent Makeup?

The Tyndall Effect is a scientific phenomenon in which light scatters through particles suspended in a medium.

In permanent makeup training, it is commonly explained this way:

When pigment is implanted too deeply into the skin, light refracts through the dermis and causes darker pigments to appear blue or gray.

In other words:

Pigment placed too deep

Light scattering occurs

Brows appear blue or gray

This explanation suggests that ashy permanent makeup is caused by technician error, specifically incorrect implantation depth. This explanation puts all the blame on the technician. It's incompetence or poorly trained technicians that is the problem, not the pigment. This is the information the manufacturers, distributors and resellers of carbon pigments are promoting. This is the information that trusting artists are repeating.

While the Tyndall Effect is a real optical phenomenon, it does not explain many of the situations artists and clients experience.

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The Major Problem With the Tyndall Effect Explanation

If pigment were implanted too deeply, the resulting color shift would become visible very soon after the skin heals.

But this is not what many clients experience.

Instead, the pattern usually looks like this:

Brows heal beautifully after the procedure

Color appears balanced and natural

Results look great for 6–12 months or longer

Gradually the brows become cooler, ashier, or gray

If the initial application of pigment depth were the problem, the discoloration would appear immediately after healing, not months or years later.

Pigment particles can move deeper in the skin long after the procedure but this is NOT due to technician incompetence. Iron oxide pigments don't do this. Carbon based pigments may migrate deeper in time. This is a carbon pigment problem, not a technician error in application.

The Tyndall Effect due to improper application isn't responsible for most cases of ashy permanent makeup.

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The Real Reason Permanent Makeup Turns Ashy

The most common reason permanent makeup brows turn gray or cool OVER TIME is pigment composition, particularly the presence of carbon black pigments. These pigments are also commonly referred to as "organic" or hybrid. Be assured these are not organic in the way you think of organic. These carbon pigments are synthesized in a lab.

Many modern permanent makeup pigments contain high levels of carbon because carbon implants easily and produces strong INITIAL color.

However, carbon pigments behave very differently from traditional iron oxide mineral pigments that were used for decades in permanent cosmetics.

Over time, these differences WILL significantly affect how permanent makeup fades.

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Carbon Pigments in Permanent Makeup

Carbon pigments consist of extremely fine particles measured at the nanometer scale.

Because the particles are so small and smooth, they implant into the skin very easily.

Carbon pigments:

Glide easily into the skin

Saturate quickly during tattooing

Require fewer passes for strong color

Heal cooler in tone

Fade very slowly

Are responsible for the crisp beautiful immediate after pics you see frequently.

These characteristics make carbon pigments popular among manufacturers because they create immediate strong results.

However, the long-term behavior of carbon pigments can create challenges.

Carbon pigments tend to remain in the skin for many years, and when they fade, they fade cooler rather than warmer. Also, they tend to migrate and are more prone to blow outs.

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Iron Oxide Pigments in Permanent Makeup

Iron oxide pigments are very different from carbon pigments.

They have:

Larger particle size

Heavier weight

Crystalline structure

Coarser texture

Because of these physical characteristics, iron oxide pigments behave differently during implantation.

Iron oxide pigments:

Are more difficult to implant into the skin

Require more passes and technique

Settle quickly in the bottle

Fade more gradually and predictably

For many years, the permanent makeup industry primarily used iron oxide–based pigments.

These pigments often faded warm or reddish, but they also faded more completely over time.

Because they faded predictably, artists could easily perform color adjustments or corrections during future procedures.

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Why Hybrid Pigments Became Popular

In recent years, pigment manufacturers introduced hybrid pigments.

Hybrid pigments combine carbon black and iron oxide ingredients in the same formula.

The concept behind hybrid pigments sounds ideal:

Carbon improves implantation and saturation

Iron oxide provides warmth and natural tones

On the surface, hybrid pigments appear to offer the best of both worlds.

However, when we examine how these two pigment types behave during tattooing, the situation becomes more complicated.

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Why Hybrid Pigments Can Be Problematic

Carbon and iron oxide pigments do not implant into the skin the same way.

Because carbon particles are extremely fine and lightweight, they implant into the skin very easily.

Iron oxide particles, on the other hand, are larger, heavier, and more difficult to implant.

This difference creates an imbalance during the procedure.

During each pass of the needle:

Carbon particles implant deeply and efficiently

Many iron oxide particles remain more superficial in the sk8n

Immediately after the procedure, both pigments are visible in the skin, creating a balanced brown tone.

But during healing, the skin naturally exfoliates and sheds superficial pigment particles.

Because many of the iron oxide particles were implanted more superficially, more iron oxide particles are lost during healing than the carbon pigment particles.

The pigment that remains most strongly in the skin is the carbon.

This often results in healed brows appearing much cooler than the original pigment color.

Importantly, this effect has nothing to do with the Tyndall Effect.

It is simply the result of two different pigment types implanting differently during the same procedure.

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Why Brows Continue Turning Ashy Over Time

Another important factor is pigment accumulation.

Carbon pigments fade extremely slowly compared to iron oxides.

Each time a client receives a touch-up, additional carbon pigment is deposited into the skin.

Over multiple procedures, carbon particles accumulate.

Eventually, the skin may contain a high concentration of carbon pigment, which causes the brows to appear:

Gray

Cool-toned

Ashy

This buildup can also lead to a condition now widely referred to as oversaturated brows.

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What Are Oversaturated Brows?

Oversaturated brows occur when the skin has received too much pigment over time, particularly pigments that do not break down easily.

Signs of oversaturation may include:

Very dark or gray brows

Skin that stops accepting new pigment

Difficulty performing color corrections

Interestingly, the term oversaturation was rarely used in permanent makeup discussions 15 or 20 years ago.

However, with the widespread use of carbon-heavy pigments and hybrid formulas, this issue has become increasingly common.

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The Role of Skin Undertones in Permanent Makeup Results

Pigment composition is not the only factor that influences healed results.

The client's natural skin undertones also play an important role.

Clients with cooler undertones—such as blue or green hues in their skin—may naturally cause pigments to heal cooler than they appear immediately after application.

This is why permanent makeup artists must understand color theory.

Before selecting a pigment, artists should evaluate:

Skin undertone

Existing pigment in the skin

Fitzpatrick skin type

Desired healed result

In many cases, artists choose a slightly warmer pigment to balance the cool tones that appear during healing.

This shift typically becomes visible within the first four to six weeks, not years later.

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The Importance of Pigment Knowledge in Permanent Makeup

Permanent makeup is both an art and a science.

Successful long-term results require more than just technical skill.

Artists must understand:

Pigment chemistry

Particle size and structure

Implantation behavior

Long-term fading patterns

Skin undertones and color theory

Without this knowledge, even technically skilled artists may produce results that age poorly.

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How Permanent Makeup Artists Can Avoid Ashy Brows

Artists who want predictable results should carefully evaluate the pigments they use.

Some important considerations include:

Evaluate Pigment Ingredients

Understanding whether a pigment contains carbon, iron oxide, or both is essential.

Study Long-Term Fading Behavior

Not all pigments age the same way. Observing healed results over time provides valuable insight.

Consider Skin Undertones

Matching pigment warmth to the client's undertones helps prevent cool healed results.

Avoid Excessive Touch-Ups

Repeated applications of carbon-heavy pigments can contribute to oversaturation.

Understand Hybrid Pigment Behavior

Knowing how different pigment particles implant can help artists anticipate healed results.

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Final Thoughts: Why Permanent Makeup Turns Gray or Blue

Ashy permanent makeup brows have become a widespread concern in the industry.

While the Tyndall Effect due to technician error is often cited as the cause, it rarely explains why brows change color months or years after the procedure.

In most cases, the real causes include:

Carbon-heavy pigment formulations

Uneven implantation of hybrid pigments

Faster fading of iron oxide components

Gradual accumulation of carbon in the skin

Basically, these ashy and oversaturated brows are primarily due to the use of carbon or hybrid pigments contrary to what the manufacturers of these pigments want you to think.

By understanding pigment chemistry and long-term behavior, permanent makeup artists can make better decisions about the products they use and the techniques they apply.

When both artistry and science work together, permanent makeup results can remain beautiful for many years.