KT-97521 Color Shift Mica Powder Red/Golden for nail art

What Makes KT-97521 a Chameleon Nail Powder

The color shift in KT-97521 is not a dye effect — it comes entirely from thin-film optical interference. The mica platelet carries alternating inorganic layers (TiO₂, Fe₂O₃, silica, tin oxide), each calibrated to a specific optical thickness. When light strikes the surface at different angles, the constructive and destructive interference conditions shift, and the eye sees the color travel from red toward golden. The effect is purely physical; there are no organic colorants that can bleed or fade under solvent exposure.

At 30–115 μm, the platelets are large enough that individual flakes catch and reflect light visibly, contributing to the mirror-like quality the KT-9000 series is known for. In our application experience, this particle range delivers the kind of high-contrast, multi-chrome flip that nail art customers are specifically looking for — the effect is immediately readable even in thin polish layers.

Technical Specifications

Chemical Composition

Heavy Metal Limits

Nail Art Application Guide for Color Shift Pigment

KT-97521 is listed for use in nail polish, gel polish, and dip powder formats. The single most impactful variable in any of those systems is substrate color. The red-to-golden shift is driven by angle-dependent interference — on a black or very dark base, the contrast is high and the shift reads immediately. On white or pale substrates, the interference colors wash out against the high background reflectance and the effect is significantly reduced.

In practice, a dedicated dark base coat before the effect layer is not optional — it is the technical foundation of the result. Applying 2–3 thin effect layers over that base coat builds depth without creating the film stress that comes from a single thick application.

Recommended Loading Levels by Format

Suspension and Particle Size Considerations

At a density of 2.7–3.2 kg/L, KT-97521 platelets are significantly denser than typical polish or gel vehicles. Settling is a real formulation challenge at this particle range, and it should be managed with anti-settling agents — bentonite and fumed silica are both commonly used in our customers' nail systems. The 30–115 μm span covers both the medium-shimmer and large-sparkle zones from our particle size guide, so the final texture profile will depend on what portion of the distribution dominates your batch.

One formulation option worth considering: combining KT-97521 with a transparent absorption pigment lets you shift the perceived base color of the formula and alter the apparent start point of the color travel. The interference effect itself stays intact since it comes from the mica substrate, not the tinting pigment.

Other Applications in the KT-9000 Series

While KT-97521 is positioned here for nail art, the broader KT-9000 Magic Chameleon Series covers a wider range of substrates and industries. The same multi-layer interference chemistry that makes these pigments effective in nail polish also drives their use in automotive custom finishes, luxury packaging, decorative coatings for motorcycle helmets and sporting goods, high-security printing, and synthetic leather. The key condition across all of those applications remains consistent: best results require a dark or black substrate to maximize the contrast of the angle-dependent color shift.

For nail art specifically, the KT-9000 two-color shift variants — of which KT-97521 is one — are the most commonly specified grade in our cosmetics-adjacent work. The four-color shift variants in the series tend to migrate toward paint, coatings, and leather applications where thicker film builds allow the full multi-color travel to be visible.

Quality and Compliance

Kolortek's quality management system is certified to ISO 9001:2015, covering production and sales of pigments and fillers. Heavy metal content for KT-97521 is tested against the limits in the table above. The all-inorganic composition — no organic dyes, no synthetic organic pigments — is inherently light-fast and contributes to good light, heat, and weather resistance across the KT-9000 series. That said, we do not publish a specific temperature resistance rating for KT-97521 in isolation; customers integrating this grade into gel systems that involve UV/LED curing at 365–405 nm should request application-specific data from our technical team.

On regulatory compliance: the INCI name and CAS numbers are confirmed in the product TDS. Kolortek has cosmetic-grade options and supporting composition documents available under EU Cosmetics Regulation (EC) No 1223/2009; grade-specific suitability for finished cosmetic products depends on the selected grade and intended use, and should be confirmed before commercial launch. REACH registration documentation is available — contact us to confirm coverage for your specific application jurisdiction.

Frequently Asked Questions

What is the colour shift range of KT-97521, and what does the shift look like in practice?

KT-97521 is a colour shift mica powder that shifts between red and golden depending on the viewing angle. The effect is produced by multi-layer thin-film interference on a natural mica substrate coated with TiO₂, iron oxide, silica, and tin oxide. On a black base coat, the shift is sharp and high-contrast — red reads face-on, golden appears at oblique angles. On pale or white substrates, the shift is much less visible.

What particle size is KT-97521 and how does that affect nail polish application?

KT-97521 has a particle size range of 30–115 μm with a D50 of 46–58 μm. In nail formulations, this spans the medium-to-large zone: medium particles (around the D50) contribute visible shimmer and strong light reflection; the larger fraction pushes toward bold sparkle with noticeable texture. For smooth brushable application without visible texture, finer grades below 25 μm are more appropriate. The higher density (2.7–3.2 kg/L) means settling management with anti-settling agents is recommended in polish and gel vehicles.

How do I use a nail art color shift pigment like KT-97521 in a gel polish formula?

For gel polish, the recommended loading for KT-97521 is 1–8% by weight. Always apply over a black or very dark cured base coat — this is the single biggest driver of shift visibility. Build the effect in 2–3 thin layers rather than one thick application. A clear top coat should follow to protect the pigment surface and enhance depth. KT-97521-specific UV/LED curing stability data is not published; if curing chemistry is a concern, contact our technical team for application testing support.

Is KT-97521 the same as a chameleon nail powder? What is the difference between duochrome and multi-chrome in this series?

Yes, KT-97521 is a chameleon nail powder — the term refers to any angle-dependent color-shifting pigment, which is exactly what the KT-9000 Magic Chameleon Series produces. KT-97521 is a two-color (duochrome) variant: it shifts between red and golden. Within the KT-9000 series, multi-chrome or triple-shift variants (the 97000 and 98000 sub-series) produce three or more distinct color states across the viewing angle. Two-color shift grades are more common in nail and cosmetic applications; four-color shift grades tend to be specified for automotive, coating, and leather end uses.

Contact our technical team to discuss formulation requirements or to request application-specific data for KT-97521 in your nail system.