The obverse design of this series was based on this photograph of Mahatma Gandhi
The Mahatma Gandhi Series of banknotes are issued by the Reserve Bank of India as the legal tender of Indian Rupee. As the name suggests, the series is so called because the observe of the banknotes prominently display the portrait of Mahatma Gandhi. Since its introduction in 1996, this series has replaced all issued banknotes.
The Reserve Bank of India (RBI) introduced the series in 1996 with the ₹10 and ₹500 banknotes. At present, the RBI issues banknotes denominations from ₹5 to ₹1000. Printing of ₹5 notes which had stopped earlier restarted in 2009. ATMs usually dispense ₹100, ₹500, and ₹1000 notes.
Security Features  
- Secure thread : The notes contain an embedded security thread that can be seen as a vertical straight line when held against light. The notes contains the words 'Bharat' in Devanagari and RBI. The ₹1000 denomination contains the number 1000 as well. Older notes however are not readable.
- Latent image : When against the light at an angle of 45 degrees an inscription of the value of the denomination is seen on the right side of Mahatma Gandhi's image.
- Microlettering : Micro-letters are used to print RBI on ₹10 notes and the value of the denomination on other notes.
- Intaglio print:
- An intaglio shape (raised shape) is present on all denominations other than the ₹10 note to help the visually impaired identify the value of the note.
- ₹20-Vertical Rectangle
- The image of Mahatma Gandhi, Reserve Bank of India seal, clause of guarantee, Ashoka Pillar emblem and signature of the governor of the Reserve Bank of India are all intaglio prints.
- Fluorescence : The number panels are printed with fluorescent ink.
- Optical Fibre : The notes have optical fibres that glow when exposed to ultra-violet light.
- Optically Variable Ink : Denominations of ₹500 and ₹1000 are printed with ink that changes color with the angle of placement to light.
- See through Register - Floral design (later issues now have the corresponding denomination) printed on the front and the back of the note coincides and perfectly overlap each other when viewed against
- EURion constellation - A pattern of symbols found on the banknote helps software detect the presence of a banknote in a digital image so that it can prevent its reproduction with devices such as color photocopiers.
The series