Ruqayyah Snyder
Australia has one of the lowest rates of money counterfeiting in the world, thanks to its innovative security features and the difficulty of replicating its unique polymer substrate. However, counterfeiting remains a persistent issue, with the Australian Federal Police investigating possible counterfeit currency and taking action under the Crimes (Currency) Act 1981. This paragraph will explore the methods and impact of counterfeiting Australian currency, as well as the measures in place to combat this illicit activity.
| Characteristics | Values |
|---|---|
| Counterfeit currency rate | One of the lowest in the world |
| Counterfeit currency material | Paper |
| Genuine currency material | Polymer substrate, a unique polypropylene material |
| Security features | Optically variable Captain Cook, diffraction grating, clear windows |
| Action to be taken on suspicion | Refuse to accept, handle as little as possible, report |
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What You'll Learn
Counterfeit Australian currency is printed on paper, not plastic
Counterfeit Australian currency is not printed on the same plastic material as genuine Australian currency. The polymer substrate used for Australian banknotes is a unique polypropylene material—it’s produced using specialised technology and isn’t commercially available. The substrate contains several film layers, which are created using a ‘bubble’ process. Clear plastic beads are melted down and blown into a large bubble. During this process, the film is stretched in both length and width to orientate the polymer molecules. The walls of the bubble are then pressed together and cooled, resulting in a clear polymer film. This base film is known as biaxially oriented polypropylene (BOPP) and has uniform tensile strength both horizontally and laterally.
The use of plastic in Australian currency was introduced in 1988 with a bicentennial commemorative $10 note. This was the world's first plastic money, and it was viewed as a success, leading to the nation's currency system being overhauled. The plastic notes were considered longer-lasting and more difficult to counterfeit than traditional paper notes. The process of creating these notes is sophisticated and involves technology generally used in the production of advanced computer chips.
Despite the use of plastic in Australian currency, counterfeit Australian currency is still printed on paper. This is because the polypropylene material used for Australian banknotes is not commercially available. As a result, counterfeiters use paper as a more accessible and familiar medium for creating fake currency.
The use of paper for counterfeiting Australian currency highlights the ongoing challenges in the fight against counterfeiting. While plastic currency was introduced to increase security and deter counterfeiting, counterfeiters continue to adapt and find ways to replicate the appearance of genuine Australian banknotes. This underscores the need for constant innovation and the development of new security features to stay ahead of counterfeiting attempts.
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Polymer banknotes are a unique anti-counterfeiting measure
The polymer substrate used for Australian banknotes is a unique polypropylene material. It is produced using specialised technology and is not commercially available, making it challenging for potential counterfeiters to access. The substrate consists of several film layers created through a "bubble" process. Clear plastic beads are melted and blown into a large bubble, during which the film is stretched in length and width to align the polymer molecules.
The resulting clear polymer film, known as biaxially oriented polypropylene (BOPP), has uniform tensile strength and enables the inclusion of see-through windows in the banknote. This film is highly durable and challenging to replicate, making it an effective deterrent against counterfeiting. Additionally, the use of a polymer varnish reduces the plastic feel of the note, further enhancing its tactile authenticity.
Australia's polymer banknotes also incorporate various security devices to prevent counterfeiting. Certain features, such as the image of a bird, serial number, and year of print, fluoresce under UV light with a specific wavelength. This fluorescence is created using rare elements like europium and other lanthanides, which are challenging for counterfeiters to access and utilise.
While polymer banknotes are not entirely immune to forgery, as demonstrated by the case of a prolific Romanian counterfeiter in 2020, they remain highly secure. Polymer Substrate Fingerprinting (PSF) is a novel anti-counterfeiting technique that leverages the random translucent patterns created by imperfections in the coating layer during the manufacturing process. This method ensures that even if counterfeiters obtain identical printing equipment and ink, replicating the stochastic manufacturing process remains extremely difficult.
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Diffraction gratings create a unique rainbow effect
Australia has one of the lowest rates of money counterfeiting in the world. This is due in large part to the innovative science behind the security features of Australian money. In 1988, Australia introduced the world's first plastic banknotes, which were significantly more durable than paper banknotes. The unique polypropylene material used for these notes is produced using specialised technology and is not commercially available, making it difficult for potential counterfeiters to obtain.
One of the key security features of Australian polymer banknotes is the use of diffraction gratings. These devices create a unique rainbow effect that is challenging to replicate. A diffraction grating is a pattern of extremely small lines coated with a thin film of a reflective material such as aluminium. When light hits this pattern, it is split into multiple beams travelling in different directions, creating a rainbow of colours. This phenomenon is known as diffraction, where light waves encounter an obstacle and create a particular effect.
The principle behind diffraction gratings is based on the wave nature of light. When light passes through a diffraction grating, it is split into multiple directions, recombining into a different pattern on the other side. This creates a unique interference pattern with bright and dark areas distinct from the original pattern of the grating. This effect can be observed in natural forms, such as the diffraction patterns caused by a bird feather discovered by James Gregory in the 17th century.
The first human-made diffraction grating was invented around 1785 by David Rittenhouse, who strung hairs between two finely threaded screws. Over time, various scientists contributed to the development of diffraction gratings, improving their design and understanding their optical properties. Modern diffraction gratings used in security features are often manufactured using specialised techniques, such as volume phase holography, which creates intricate patterns with high efficiency and reduced surface scattering effects.
The inclusion of diffraction gratings in Australian polymer banknotes creates a unique visual effect that serves as an effective countermeasure against counterfeiting. By utilising innovative science and technology, Australia has successfully enhanced the security of its currency, contributing to its low rate of money counterfeiting worldwide.
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Traditional anti-counterfeiting measures include raised printing
Australia has one of the lowest rates of money counterfeiting in the world, thanks to the innovative security features of Australian currency. The introduction of polymer banknotes was a significant breakthrough in increasing the security of Australian money. The unique polypropylene material used for these banknotes is produced using specialised technology and is not commercially available. The substrate contains several film layers created using a 'bubble' process, where clear plastic beads are melted down and blown into a large bubble. This results in a clear polymer film with uniform tensile strength both horizontally and laterally, allowing for the inclusion of a see-through window in the banknote.
Traditional anti-counterfeiting measures for paper currency include fine detail with raised intaglio printing on bills, allowing non-experts to easily spot forgeries. The intaglio printing process involves fabricating master printing plates with fine-line engravings, which are then used to produce the plates for the printing presses. The embossing effect and thick layer of ink cause the printed lines to be raised, giving the notes a distinctive look and feel. This produces lifelike portraits that are difficult to duplicate exactly. Additionally, the complex, unbroken fine-line patterns in the borders and backgrounds are not well duplicated by lower-resolution copiers or printers.
Other traditional anti-counterfeiting measures include watermarks, microprinting, colour-shifting inks, and design features such as the "EURion constellation", which disables modern photocopiers. On coins, milled or reeded edges are used to show that none of the valuable metal has been scraped off.
To further enhance the security of Australian currency, the latest polymer banknotes incorporate additional security devices such as holograms, optically variable devices (OVDs), and diffraction gratings. These advanced features create unique visual effects that are challenging to replicate, further deterring potential counterfeiters.
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Australian currency has multiple security features
The clear window in Australian banknotes serves as an integral security feature. It should be a seamless part of the banknote, and the images or features within it should not be easily rubbed off. This window may contain a three-dimensional image with a colourful border, creating a raised or recessed effect when the banknote is tilted. In some cases, the window may even feature a moving image, such as a bird flapping its wings and changing colour.
Another security feature of Australian currency is the inclusion of UV fluorescent elements. The serial numbers of genuine Australian banknotes should fluoresce under ultraviolet light, and rectangular or square patches indicating the value of the banknote also become visible under UV light. To validate these UV features, a UV black light with a specific wavelength centred around 365nm is recommended, along with low ambient lighting conditions.
In addition to these features, Australian banknotes may also incorporate tactile features like Braille dots to enhance accessibility for visually impaired individuals. The development and upgrade of security features in Australian currency are ongoing, with new banknotes introducing future-proof security measures to stay ahead of counterfeiting attempts.
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Frequently asked questions
Australian banknotes are made of a unique polypropylene material, which is a type of plastic. This material is produced using specialised technology and is not commercially available.
Australian banknotes have several security features that make them difficult to counterfeit, including:
- Diffraction gratings, which create a rainbow of colours when light hits them.
- Clear windows, which are continuous with the rest of the note and may be slightly cloudy.
- Film layers created using a "bubble" process, which gives the notes uniform tensile strength.
- Other traditional anti-counterfeiting measures, such as raised intaglio printing and milled or reeded edges.
Australia has one of the lowest rates of money counterfeiting in the world due to its advanced security features. However, there have been instances of counterfeit notes circulating, such as fake $50 notes in Canberra in 2016 and Chinese language $100 notes in Darwin in 2017.
