Optically variable pigments.* Patent No. U.S. 6,521,036 B1
SICPA has obtained a patent for optically variable pigments having a color shift between two distinct predetermined pre·de·ter·mine
v. pre·de·ter·mined, pre·de·ter·min·ing, pre·de·ter·mines
1. To determine, decide, or establish in advance: colors. The optically variable pigment is comprised of a multilayer thin-film interference stack having first and second substantially parallel planar A technique developed by Fairchild Instruments that creates transistor sublayers by forcing chemicals under pressure into exposed areas. Planar superseded the mesa process and was a major step toward creating the chip. surfaces. The multilayer stack includes an opaque reflecting layer having first and second substantially planar surfaces that are parallel to the first and second parallel planar surfaces of the multilayer stack and at least one sequence disposed on one of the first and second surfaces of the opaque reflecting layer. Each sequence is comprised of a dielectric dielectric (dī'ĭlĕk`trĭk), material that does not conduct electricity readily, i.e., an insulator (see insulation). A good dielectric should also have other properties: It must resist breakdown under high voltages; it should not layer with an index of refraction Index of refraction
A constant number for any material for any given color of light that is an indicator of the degree of the bending of the light caused by that material.
Mentioned in: Eye Glasses and Contact Lenses of 1.65 or less and a semi-transparent partially reflecting layer with the dielectric layer of said sequence being first disposed on the totally reflecting layer, wherein the totally reflecting layer is made of a corrosion-resistant aluminum alloy by physical vapor deposition This article or section is in need of attention from an expert on the subject.
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