Signing a Print?

[Paranormalist]

Say I print out an image of my own on A4 glossy photo paper for someone and they want it hand signed - how do I go about signing it and what with?

Ta.

 

[konastab01]

Sharpie?
They write on basically anything...
To a certain degree

 

[milkmanchris]

Sharpie?
They write on basically anything...
To a certain degree

+1 that, great pens.