1 In a fake note the security thread that passes through the note is tampered and is broken in between whereas in a genuine note the thread is visible in a straight line. It contains the words "Bharat" in the Devanagri script and "RBI" appearing alternately.
2 The number panel of the notes are printed in fluorescent ink and are of standard size (if a number mentioned on the top right hand corner of the note varies in size, then it is a forged note).
3 The `micro-lettering' technology used in the printing of a note provides additional security to the notes against counterfeiting. Micro-printing like "RBI 100" is printed that can be seen using magnifying glass.
4 Braille Mark -- An identification mark has been introduced in the new series note for visually impaired people. This mark is in intaglio printing and it has different geometrical shapes for various denomination. For Rs 100 denomination, we have triangle as the identification mark.
5 The image of Mahatma Gandhi on the left side of the currency note is printed exactly the same like the one printed on the right hand side of the note. When the note is put underneath a bulb or looked up in the natural light, the image of Mahatma Gandhi on the left side of the note becomes clearly visible.
6 When the currency note is placed under the Ultra violet lamp it one can see the image of twinkling stars.
7 The fluorescent ink used in the printing of the currency note is water and soap resistant and dries quickly on getting wet.
8 The printing of a currency note has distinct and vivid colours.
9 The watermark in new currency note depicts Mahatma Gandhi, visible from both front and back in transmitted light. Cannot be replicated using scanning or photocopy equipments.
10 The portrait of Mahatma Gandhi, Reserve Bank Seal, guarantee and promise clause, Ashoka pillar emblems on the left, RBI governor`s signature are printed in intaglio, that is in raised prints. (IMP)
11 I, J, O, X, Y, Z alphabets are not used in alphabet series on any note.
LATENT IMAGE : There is a vertical band on the right side of Mahatma Gandhi's portrait which contains the image of the notes denomination. The image appears only when light is allowed to fall at an angle of 45 degrees on the note, otherwise it appears as a vertical band.
MICROLETTERINGS: This appears between the vertical band and the portrait. It can only be seen better through a magnifying glass. For Rs 10 notes, it contains the word "RBI". Notes of Rs 20 and above contain the denomination value of the note.
IDENTIFICATION MARK: On all notes except Rs 10, there is a special intaglio feature on the left of the water-mark specially for the visually impaired. This feature varies according to the denomination of the note. They are: Rs 20: Vertical Rectangle, Rs 50: Square, Rs 100: Triangle, Rs 500: Circle, Rs 1000: Diamond.
INTAGLIO PRINTING: In notes of Rs 20 and above, the Gandhi portrait, RBI Seal, guarantee, promise clause, Ashoka Pillar emblem, and the governor's signature are printed in intaglio or raised print.
FLUORESCENCE: The number panels are printed in fluorescent ink. The notes have also optical fibres which can only be seen when exposed to a ultra-violet lamp.
OPTICALLY VARIABLE INK: The numerals of the Rs 500 (revised colour scheme of milk yellow, mauve and brown) and Rs 1000 notes is printed in optically variable ink (a colour shifting ink). The colour of the numerals on the note is green when held flat but will turn blue when the note is held at an angle.
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If you want to check whether all the notes that you possess are genuine or a fake one then you may click on this link UV fake note detector