India's currency notes are embedded with several advanced security features designed to prevent counterfeiting and ensure the integrity of the currency in circulation. These features are both intricate and innovative, providing a high level of security.
One of the most noticeable features on the 500- and 1,000-rupee notes is the use of Optically Variable Ink. This ink changes color based on the angle of viewing, appearing green when the note is flat and turning blue when tilted. This color-shifting property makes it difficult for counterfeiters to replicate, providing an added layer of security.
The Intaglio printing technique is utilized to create raised designs on the surface of the currency notes. These raised patterns can be felt by touch, offering a tactile element that helps the visually impaired identify the denomination and adds another hurdle for those attempting to produce fake notes.
Between the portrait of Mahatma Gandhi and a vertical band on the currency note lies a Latent Image. This feature displays the letters 'RBI' in small text for 5- and 10-rupee notes, and the note's denomination for higher values. The image is visible only when the note is held at a particular angle, enhancing the note's security.
A narrow strip known as the Security Thread runs across the width of the currency note. This thread is engraved with the words “Bharat” and “RBI,” visible on the front side and hidden on the reverse, offering a simple yet effective anti-counterfeiting measure.
Another critical security feature is the Watermark, specifically referred to as Watermark SRIRAM. This rectangular image is printed on the obverse side of certain denominations and shows the value of the note in numbers. It is visible only when the note is held at an angle, making it a subtle but effective security measure.
These features collectively play a crucial role in maintaining the authenticity and trustworthiness of Indian currency. As technology evolves, so too do the methods to enhance currency security, ensuring continued public confidence in the nation's monetary system.
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