Article On Banknote Security Features

Good stuff, thanks.

& just 1 of the many reasons I enjoy collecting currency. Even the older series's security features are fun to explore. In fact, I have seen some bogus notes printed for the 2004 upgraded Journey $20 (& other denominations). One thing that I found was surprising is that the fake's serial number font was off/all wrong. Prefixes were incorrect & often a couple fakes will have the same # (I guess just copies meant to fool a few people at a time). You would think after they went to all the trouble of duplicating most of the design elements, they'd try a bit harder to get the SN right (a rather old simplistic security feature).

So, what security features are the most used?

Very interesting!

-Interesting & certainly an inexpensive option. Did you find that the Central bank of Ireland state that this was actually a security feature used (or was this from simple observation)?

From our Charlton catalogue it states that "Howard Smith bank note paper was used, in which green planchettes were embedded as a security device." These were a fairly efficient, inexpensive (uncomplicated) device which has been described on page 201 of the 31st Edition of Charlton (2019). They look like these 3 little green dots on border of this 1935 initial Bank of Canada $2.00 banknote. You can also see fainter (smaller ones) in the design above "The" & on Queen Mary's choker styled necklace:

Several Germany notes between the wars used copious amounts of fibers, all on one side of the note.

Here is an example of an Irish note which uses the type of fibres in the paper you refer to. This one has the fibres in a strip down the centre of the note.