Home Glossary Spark orbital Spark orbital By - 25/01/2018 147 An optically variable ink changes colour and brightness, giving the impression of dynamic movement. A bright ring can be seen moving around a central point of the image. + posts Windowed Anti stokes ink Anticopy Cornerstone watermark 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 Related Content 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