Composition including dual cavity color shifting pigments

[0068]The Figures show calculated optical properties, wherein the interval markings, on the curves that define the process path relative to dielectric physical thickness, represent 5 nm physical thickness intervals of a theoretical magnesium fluoride dielectric layer with a refractive index of 1.38 across the visible spectrum, an aluminum reflector layer, and a chromium absorber layer.

[0069]To create the most chromatic red, a dielectric layer cannot be thicker than 215 nm, based upon using magnesium fluoride as the dielectric material, without a sharp reduction in chroma, which occurs at approximately 40 degrees hue angle. A desired face color was a red with a hue angle close to 30 degrees without any decrease in chroma or color stability.

[0070]A single cavity color shifting pigment included in the composition included: Absorber-Chromium (6.0 nm) / Dielectric-magnesium fluoride (440 nm) / Reflector-Aluminum (40 nm) / Magnetic-stainless steel (26 nm) / Reflector-Aluminum (40 nm) / Dielectric-m...

[0075]The compositions discussed above were also made to obtain a blue face color. The same single cavity color shifting pigment and the same dual cavity color shifting pigment were used in the same various blend compositions, but with a focus on the violet to bronze color shift at the other end of the wavelength spectrum. FIG. 9 illustrates the overlaid process paths for the single cavity color shifting pigment, the dual cavity color shifting pigment, and the blend path. The composition exhibited a face color that cannot be achieved by either the dual cavity color shifting pigment or the single cavity color shifting pigment alone.

[0076]From the foregoing description, those skilled in the art can appreciate that the present teachings can be implemented in a variety of forms. Therefore, while these teachings have been described in connection with particular embodiments and examples thereof, the true scope of the present teachings should not be so limited. Various changes and modifica...