Multiple choice general knowledge

What is it known as: Notes of Rs. 500 and Rs. 1000 have their numerals printed. Number appears green when note is held flat but changes to blue when viewed at angle.

  1. Latent image

  2. Optically variable ink

  3. Microlettering

  4. Fluorescence
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Optically variable ink (OVI) is a special ink that changes color when viewed from different angles. On Rs. 500 and Rs. 1000 notes, the numeral appears green when viewed flat but changes to blue when the note is tilted. This color-shifting property is extremely difficult to replicate and serves as a key anti-counterfeiting measure. Latent image requires horizontal viewing, microlettering needs magnification, and fluorescence requires UV light.

Keep practicing — related questions