The light transmitted and reflected by all-dielectric optically variable
pigments varies according to viewing angle. The color travel of an
all-dielectric optically variable pigment depends on amplitude changes
and wavelength shifts in reflectance peaks of the pigment. The width and
center wavelength of reflectance peaks can be controlled by selecting the
ratio of thicknesses between high-index and low-index layers in a thin
film stack. Reflectance peaks can regenerate or become suppressed and
shift with tilt angle, thus providing a wide variety of color
trajectories.