by wpengine | Aug 11, 2021Thin two-dimensional metamaterial layers that allow or inhibit the propagation of electromagnetic waves in desired directions.
by wpengine | Aug 11, 2021A unit of measurement commonly used in authentication when referring to the thickness or gauge of physical substrates and features. One micron is equal to one millionth (10-6) of a metre.
by wpengine | Aug 11, 2021This is print that is so small that it cannot be reproduced by photocopying or scanning, and can only be read under magnification.
by wpengine | Aug 11, 2021Images formed by the superimposition of two patterns with different periodicities, so that they display different visual effects according to the viewing angle.
by wpengine | Aug 11, 2021A method of paper manufacture that drains stock through a mesh cylinder. This is not customarily used for documents like tax stamps due to the weight of the paper and is rather used for banknote paper production.