All-dielectric diffractive pigment flakes can be applied to an object to
impart a diffractive effect to the object without substantially changing
the background color of the object. In one case, such diffractive pigment
flakes can be applied to a white object to impart a white diffractive
effect. The thickness of the dielectric layers in the diffractive pigment
flakes can be chosen to provide thin-film interference, as well as
diffraction from the interfaces between layers patterned with a
diffraction grating. In some cases, the thin-film interference can provide
color shifting in addition to the diffractive effect.
