Interesting secret hidden under the famous banknote of the country of kangaroos

Reddit users went viral after a manager discovered that irradiating Australian banknotes with ultraviolet light revealed hidden images of birds. Reddit account C_Horse21 discovered the $100 bill and shared it online, quickly garnering more than 2,400 "upvotes" and sparking a frenzy of comments.

The "invisible" feature on Australian banknotes.

Each Australian note has three 'invisible' features - a bird, serial number and printed year - created with fluorescent ink. Each banknote has a different bird species: nectar (AU$5 note), cockatoo (AU$10 note), kookaburra (AU$20 note), black swan (AU$50 note) and owl (AU$100 note).

Although the hidden bird may have caused a wave of excitement with various conspiracy theories from the online community, it is actually one of a number of unique security measures built into the design of the currency to fight back. the act of printing counterfeit money.

The windows

The image of the window on Australian money also helps you determine if a note is 'dirty' or not.

The top-to-bottom window running up the middle of any note is a trademark feature of Australian hard currency. However, many of the pictures included in the windows are not just decorative - they also help you determine if a bill is 'dirty' or not.

The star-shaped image at the top of the window will rise or fall as you tilt the note. The same 'tilt test' can also be applied to birds in flight with contours in the window, which will move their wings and change color as the bill is moved.

The more detailed colorful bird in the window will also change color when noting at each corner. A seven-pointed star in the bottom right window of the note will also be clearly visible when held up to the light.

Numbers and colors

The number on the Australian banknote will reflect itself as the bill is moved, appearing both forward and backward depending on how the bill is tilted. Another sign of an authentic note is the 'rolling color effect', with a kaleidoscope of colors visible inside the bird in the top left corner of the note.

This "color test" is also where UV ink appears, with the "secret" bird spotted on Reddit visible on real banknotes when exposed to central wavelength UV light. about 365nm.