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.