What are the security features of a prize bond?

These bonds are printed in the offset process on SPL made paper & would carry the
following security features:

In paper:

  1. enlarge watermark
  2. micro-printed security thread
  3. invisible colored fiber.

In printing:

  1. micro-printed tint in rainbow colour
  2. guilloche patter
  3. visible fluorescent rosette
  4. invisible denomination print
  5. numbering in red fluorescent ink.