Kudos to Council of EU glossary
Several security features which include guilloches, background printing, rainbow printing, invisible fluorescent printing or mixed into visible ink, micro-printing, OVIs and modified fonts just to name a few, are applied on the security documents such as Bank Notes, Currencies, Passports, Driving Licenses, promissory notes etc to enhance the security features. While many of the features are in use as known to those in security printing the list of such security document is exhaustive. For example in Watermark itself the features range from Single tone, Duo tone to Multi tonal Water marks. One has to therefore understand the differences between them to conclude how the features can be effectively applied on specific documents to combat counterfeiting.
In order to basically get an idea of how various features look like especially for those engaged in security printing, those appearing for interviews in the printing fields and students in printing, one can go to the following site which is the single source that has documented all the features -narration with illustrations- to explain each and every feature.
THOSE WHO CAN NOT UNDERSTAND THE CERTAIN TERMS CAN APPROACH ME THROUGH MY E MAIL ID AND I CAN FURTHER EXPLAIN THEM THE TERMS.