Home Glossary Deffractive optical Variable device Deffractive optical Variable device By - 25/01/2018 33 An optically variable feature composed of grids that diffract light. This allows various images and effects to be generated, including colour changes (shifts) as well as 2D and 3D images. + posts Windowed 1D Barcode 2D Barcode Bleeding RELATED ARTICLESMORE FROM AUTHOR Glossary Invisible Personal Information (IPI) Glossary 3D Photo Glossary Invisible Personal Information (IPI) Glossary Hotfoil Glossary Transparent ink Glossary Unique font Must read Designing identity documents Nick Nugent - 01/10/2015 0 Identities in the blockchain Peter Hoogendoorn - 08/10/2018 0 Designing better banknotes Dr Andrea Firth - 01/10/2011 0 The golden harmony of Fibonacci Anton Bleikolm - 01/02/2012 0 Does money make you ill? Marcus Riemann - 01/10/2014 0 Load more