Security OVD’s/Holograms
An optical variable device (OVD) is based on diffractive optical structures. This gives the labels the appearance of having different patterns, colours, and designs depending on the amount of light striking the OVD and the angle the OVD is viewed at. Holograms are a type of OVD. The changes of appearance when rotating and tilting are reversible, predictable, and reproducible.
OVDs cannot be photocopied or scanned, nor can they be accurately replicated or reproduced. OVDs are often used as security devices and anti-counterfeiting measures and can be created through a combination of printing and embossing.
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