SwitchWhiteâ„¢ looks diffuse and non-spectral over a wide range of angles, totally unlike dot-matrix or other grating-based OVDs. When you tilt the image, however, the contrast completely reverses producing an obvious switch. This effect cannot be confused with a printed simulation or standard grating-based image. This technique can be used on its own for a subtle non-spectral look, or can be combined with other technologies.