1. See through Register
Small floral design called ‘See through Register’ is printed at front (hollow) & back (filled up) of the note in the middle of the vertical band besides the Watermark has an accurate back to back registration. The design appears to be one floral design when seen against the light.
The Mahatma Gandhi Series of bank notes have the Mahatma Gandhi watermark with a light and shade effect and multi-directional lines in the watermark window. You can see this Watermark by tilting the note against the light.
3. Optically Variable Ink
This is altogether a new security feature which is used in the Rs.1000 and Rs.500 notes with revised colour scheme introduced in November 2000. The numbers 1000 and 500 on the obverse of Rs.1000 and Rs.500 notes respectively is printed in optically variable ink viz., a colour-shifting ink. The colour of the numbers 1000/500 appears green when the note is held flat but it will change to blue when the note is tilted at an angle.
Number panels of the currency notes are printed in fluorescent ink. The notes also have optical fibres. Both are visible when the notes are exposed to ultra-violet lamp.
5. Security Thread
Rs. 1000 notes consists of a readable, windowed security thread alternately visible on the obverse with the inscriptions ‘Bharat’ (in Hindi), ‘1000’ and ‘RBI’, but completely embedded on the reverse. The Rs.500 and Rs.100 currency notes also have a security thread with similar visible features and inscription ‘Bharat’ (in Hindi), and ‘RBI’. When you hold against the light, the security thread on Rs.1000, Rs.500 and Rs.100 is visible as one continuous line.
The Rs.5, Rs.10, Rs.20 and Rs.50 notes contain a readable, completely embedded windowed security thread with the inscription ‘Bharat’ (in Hindi), and ‘RBI’. The security thread can be seen to the left of the Mahatma’s portrait.
6. Intaglio Printing
The portrait of Mahatma Gandhi, the Reserve Bank seal, guarantee and promise clause, Ashoka Pillar Emblem on the left, RBI Governor’s signature are printed by intaglio printing that is in raised prints, this type of printing can be felt by touch, in Rs.20, Rs.50, Rs.100, Rs.500 and Rs.1000 notes.
7. Latent Image
On the obverse side of Rs.1000, Rs.500, Rs.100, Rs.50 and Rs.20 notes, a vertical band on the right side of the Mahatma Gandhi’s portrait contains a latent image showing the respective value in numeral. The latent image is visible only when the note is held horizontally at eye level.
This feature is visible between the vertical band and Mahatma Gandhi portrait. It contains the word ‘RBI’. This feature appears well under a magnifying glass.
9. Identification Mark
A unique feature in intaglio has been introduced on the left of the watermark window on all notes except Rs.10/- note, for the visually impaired for identification of the denomination. This feature can be found in different shapes for various denominations (Rs. 20-Vertical Rectangle, Rs.50-Square, Rs.100-Triangle, Rs.500-Circle, Rs.1000-Diamond).
10. See through Register
The small floral design called ‘See through Register’ is printed both on the front (hollow) and back (filled up) of the note in the middle of the vertical band besides the Watermark has an accurate back to back registration. The design appears to be one floral design when seen against the light.