Optically variable AKA color- shifting contain minuscule flakes of special film which changes color when viewed at different angles. many major modern banknotes, as well as on other official documents.
It's generally used only in small areas, because the high cost.
advisoryThe printing security postal stamps have several inbuilt security features in them to ensure that they are not easily counterfeited, although the design on the security postal stamps may appear to be very simple.
As specialists in security certificate printing manufacturer, personalisation and design supplier, KC T-Security offer many innovative and highly effective security features.