Home Glossary Deffractive optical Variable device Deffractive optical Variable device By - 25/01/2018 12 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 Varifeye Watermark Transparent ink Unique font RELATED ARTICLESMORE FROM AUTHOR Glossary Invisible Personal Information (IPI) Glossary 3D Photo Glossary Invisible Personal Information (IPI) Glossary Hotfoil Glossary Unique font Glossary UV Ink 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