Optaglio's sister company Metallic Security has also described holographic microprinted
planchettes in WO 08029175.
Magnetic, fluorescent, phosphorescent, microprinted
, and clear text security threads can also be embedded in the polymer banknote.
There's a plastic strip with the words USA, twenty, and a small flag microprinted
borders contain printing too small to be reproduced by standard techniques.
text looks like a thin line to the naked eye.
words become illegible when scanned or photocopied.
The words ``United States of America'' in microprinting visible with a magnifying glass along the lower left rim of Jackson's portrait and microprinted
``USA'' within the numeral 20 in the lower left.
The words "United States of America" are microprinted
on Ben Franklin's coat, and the phrase "USA 100" is microprinted
inside the "100" in the bottom left corner.
Boston, West & Richardson 1818) (1787) (describing the duty "to bestow relief upon the poor" as "founded in the law of nature), microprinted
on American Antiquarian Society, Early American Imprints, 2d Series, No 45200 (Readex Microprint).
In the near term, they suggested introducing inks that change color when viewed from different angles, improving a microprinted
thread running vertically through the paper, and employing watermarks, hard-to-copy dot patterns, and moire patterns, which blur when photocopied.