It's done in tipp-ex,
directly on the glass.
(
DogHorse plop,
Wed 25 Nov 2009, 22:21,
archived)
Yes. Yes it is.
You can see where he changed his mind a few days later and tried to scratch it off.
(
wuffle, the b3ta bunny 's flea collar isn't working on,
Wed 25 Nov 2009, 22:23,
archived)