Multiple choice general knowledge

Whatis it called: Number panels glow under ultra-violet light.

  1. Fluorescence

  2. Latent image

  3. Watermark

  4. Back-to-back registration
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A Correct answer
Explanation

Fluorescence is the property where certain security features on currency notes glow when exposed to ultraviolet (UV) light. The number panels on banknotes are treated with fluorescent ink that becomes visible only under UV light, making counterfeiting much more difficult. Latent image requires tilting, watermark is visible against normal light, and back-to-back registration involves design alignment.

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