"T i m" wrote in message
...

Not easily .. but if I gave her the chance she'd engrave it like she
has with all our (petrol station) tumblers ;-)

Throw them away now (most petrol station tumblers used to be toughened
glass, I've not had one for a decade+.).
Engraving toughend glass can cause them to shatter with no warning.
Sand blasting/chemical etching is about as far as you can go with toughend
glass.