KT-90552 Green/Red Color Shift Pigment

What KT-90552 Does — and Why the Effect Works

The color shift in KT-90552 is not a dye or a printed pattern — it is a physical interference effect. The natural mica platelet carries multiple deposited layers of TiO₂, Fe₂O₃, and silica. As viewing angle changes, the optical path length through those layers shifts, constructively reinforcing different wavelengths. The result is a clean green at near-normal incidence that transitions toward red at oblique angles.

In our application lab, we consistently see the green/red travel described as one of the more visually striking two-tone shifts in the KT-9000 range — the spectral distance between green (~530 nm) and red (~630–650 nm) is wide enough to read as a sharp, unmistakable transition rather than a subtle hue drift. That said, the strength of the effect depends heavily on what is underneath it.

On a black or very dark substrate, contrast is maximized and both colors read clearly. On a white or light substrate, the semi-transparent nature of the platelet allows the base to compete with the interference color, washing out the perceived shift. This is not a defect — it is the physics of interference pigments — but it is the single most common source of disappointment when formulators first trial chameleon grades without a dark base coat.

Technical Specifications

Chemical Composition

The all-inorganic composition — mica, iron oxide, silica — is what gives this series its resistance profile. These are thermally and chemically stable materials. The specific temperature resistance ceiling for KT-90552 is not published in our current datasheet, but the inorganic pigment system inherently supports the heat ranges typical of most industrial coating bake cycles. Confirm with your coating system if you are running above 200°C.

Applications: Where KT-90552 Performs

From our experience supporting coating customers across several industries, the KT-9000 Chameleon Series — and KT-90552 in particular — sees its heaviest use in automotive custom finishes and wraps. The green/red shift reads exceptionally well on curved automotive body panels, where the changing angle of the surface relative to the viewer puts the full color travel on display continuously as the car moves.

Beyond automotive, verified application areas for this grade include:

• Decorative coatings — motorcycle helmets, sporting goods, consumer electronics housings
• High-end cosmetics and nail art (cosmetic-grade suitability should be confirmed for the specific intended use and market)
• Luxury packaging and specialty printing
• Security and anti-counterfeiting printing — the angle-dependent color shift is difficult to replicate with standard printing inks
• Industrial and plastic coatings, synthetic leather, dispersion paints
• Automobile lacquers and, with a weatherproof coating system, architectural applications

One thing to note: KT-90552 is a coating color shift pigment by primary design. It is optimized for liquid coating and paint systems. Use in plastics is supported at the series level, but the shear experienced during extrusion or injection molding can damage platelet geometry — always confirm processing conditions before committing to a formulation run.

Formulation and Processing Guidelines

Dispersion

Platelet-structured effect pigments like KT-90552 require gentle handling during dispersion. We always recommend pre-dispersing the pigment in a portion of solvent or resin binder before adding to the full batch. Avoid high-speed dispersers, bead mills, and sand mills — the mechanical shear will fracture the platelet, reducing aspect ratio and degrading both the mirror effect and the color shift intensity. A slow paddle mixer or low-shear dissolver is appropriate. Add the pigment at the last stage of the mixing sequence.

Loading Rate

General guidance for coatings applications is 1–20% by weight, starting at the low end and increasing to achieve the desired effect intensity. A product-specific loading recommendation for KT-90552 is not published — trial across your target range, as heavier loading increases the perceived color travel depth but may affect surface smoothness depending on film build and application method.

Compatibility and System Considerations

KT-90552 is compatible with most resin systems at the series level. The pH operating range of 6.0–9.0 covers the majority of waterborne and solventborne coating formulations. One area that warrants a bench test first: acid-catalyzed baking enamels. The acid catalyst environment can interact with iron oxide-coated pigments; check compatibility before scaling.

Settlement in the can is a practical issue with any dense platelet pigment. Anti-settling agents — fumed silica, bentone, or similar thixotropes — keep the pigment suspended without disrupting orientation. If you are seeing streaking or uneven color shift in the applied film, the most common causes are thinner type mismatch, inadequate flash time between coats, or insufficient orientation time before cure. Adjusting these before reformulating will typically resolve the issue.

For automotive and other durable coating applications, finish with a clear topcoat over the chameleon layer. This protects the pigment surface, adds depth to the optical effect, and significantly extends service life in exposure conditions.

Modifying the Color Shift Range

KT-90552 can be blended with transparent absorption pigments to shift the apparent base color or modify the perceived angle of the color travel. In our experience, this is a useful lever when a customer needs the green/red shift anchored to a specific starting hue. Keep in mind that the transparency of any co-binder pigment directly affects whether the interference colors read cleanly — opaque additions will suppress the shift.

Quality, Compliance, and Supply

Kolortek operates under ISO 9001:2015 certification covering the production and sales of pigments, glitters, and fillers. The MSDS for KT-90552 references REACH Regulation (EC) No. 1907/2006, and the product is classified as non-hazardous under CLP Regulation (EC) No. 1272/2008. Heavy metal content is controlled to defined limits across all regulated elements (As <2 ppm, Pb <10 ppm, Hg <1 ppm, Cd <3 ppm, among others).

For cosmetic applications under EU Cosmetics Regulation (EC) No. 1223/2009 or US FDA color additive requirements, suitability is grade-dependent. Contact us to confirm whether KT-90552 is the correct grade for your intended cosmetic or personal care use, rather than assuming series-level claims apply.

KT-90552 uses natural mica as its substrate, consistent with the KT-9000 series. Where synthetic mica (fluorphlogopite) is required — for fluorine-free cosmetic compliance or improved whiteness as a base — alternative grades in the broader KT-9000 range are available. We maintain an Iriodin Alternative Cross-Reference program for customers transitioning from Merck Iriodin® grades; a specific equivalent mapping for KT-90552 is not published in the current catalog, but our technical team can assist with direct comparison.

Frequently Asked Questions

What particle size does KT-90552 have, and does it affect spray application?

KT-90552 has a particle size range of 20–80 μm with a D50 of 25–35 μm. At the coarser end of that range, there is a real risk of nozzle clogging in conventional spray equipment. For spray application, filter or pre-screen the batch and confirm your spray tip orifice size accommodates the full particle distribution. If consistent spray delivery is a priority, contact us to discuss whether a finer-cut grade within the KT-9000 series is more appropriate.

Why does the color shift look weak in my formulation?

The most frequent cause is substrate color. KT-90552 is a semi-transparent interference pigment — it requires a dark, ideally black, base to develop its full green/red color travel. On white or light-colored substrates the shift is significantly reduced. A secondary cause is mechanical damage: if the pigment was processed through a bead mill or high-speed disperser, platelet fracture reduces the mirror effect and color shift intensity. Use slow paddle mixing and add the pigment last.

Is KT-90552 suitable as a paint color shift pigment for automotive refinish use?

Yes — automotive custom finishes and wraps are the primary application for the KT-9000 Chameleon Series. KT-90552 works in both solventborne and waterborne automotive basecoat systems, provided the pH stays within the 6.0–9.0 range and the formulation avoids high-acid environments. Apply over a black basecoat, use a clear protective topcoat, and confirm compatibility with any reactive catalyst in the binder system before production use.

What makes KT-90552 different from other grades in the KT-9000 Chameleon Series?

KT-90552 is specifically formulated for the green-to-red color travel axis — a wide spectral shift that is visually distinct from the shorter-range hue drifts seen in some other chameleon grades. The KT-9000 series also includes clear chameleon duochrome grades (KT-921xx to KT-926xx), TiO₂-free options, and multicolor triple-shift variants (KT-972106, KT-973206, among others). The right grade depends on the color travel range, substrate, and application method your formulation requires.

Contact our technical team to discuss formulation requirements or to request a sample of KT-90552 for your specific application.