Covert security feature simplified
As you begin to research using security printing to secure your product or documents, you will hear a lot of terms being tossed around.
Two terms commonly used are Covert and Overt. Similar words with opposite meanings.
Covert simply means a hidden image invisible to the naked eye.
An example of a covert image would be one printed with invisible UV inks that fluoresce under UV light. The example in this picture is a €20 banknote under ultraviolet light.
Overt Security feature simplified
On the other hand, overt means something that is visible to the naked eye. For example, a hologram is an overt printing technique.This picture is of a passport hologram, which quickly allows an inspector to glance at the passport and verify the hologram.
This is one line of defense, among several on a passport.