However skillfully you forge a currency note the genuinity cannot be achieved. The differences will be due to the paper, ink, human element and above all unavailability of the security measures taken by the currency press by the government.

The genuine notes are made of a special type of paper which is manufactured in security paper mill, Hoshangabad (M.P). In printing, multicolored impressions are used with the intaglio printing process. 

The forgers use various methods for making the counterfeit currency,

1. Photographic method
2. Process made forgery
3. Hand engraved blocks
4. Lithographic process
5. Hand drawn forgery

Forged notes usually exhibit certain characteristic differences which facilitate easy identification. There are number of distinguishable features when compared with genuine notes. Following differentiating features are found.

1. Size: While cutting in bundles the size of the forged notes are not same, while the size of genuine currency is fixed.
2. Size of printed design: The technique used for printing the genuine notes is highly sophisticated. It gives each and every line in printing with clear and sharp images. It is not possible with the counterfeit currency.
3. Watermark: In counterfeit notes the watermark is made by using opaque ink, painting with white solution, stamping a die, engraved with the picture of Mahatma Gandhi and also by applying oil, grease or wax to give the transparent image of Mahatma Gandhi.
4. Security Thread: In genuine notes the security thread is incorporated into the paper at the time of manufacture of the paper. The security thread in counterfeit notes is imitated by drawing a line by pencil or printing a line with grey ink or by using an aluminum thread while pasting two thin sheets of paper. In genuine notes over security thread one can read the word RBI and BHARAT (in Hindi).
5. Numbering: In counterfeit currency it is difficult to reproduce the same shape of individual numbers again and again with accuracy. The alignment of figures is also difficult to maintain by forgers. Spreading of ink, smaller or bigger number, inadequate gaps, and different alignments in numbers can be regarded with suspicion.
6. Quality of printing: In counterfeit notes the printed lines will be broken and there may also be smudging of ink.