In Reply to: What do u mean by "chalk up"? posted by kierans on Monday, 10. August 2009 at 11:31 Bali Time:
collection area, you will see some that have chalk or crayon crosses on them.
These have been picked out by the X-ray guys on the other side of the wall (all baggage is X-rayed upon unloading)as being worth a look by the guys at the desks. (Maybe the shape of a bottle or two seen?!)
Some shifty people carry "wet wipes" or similar, just to wipe such crosses from their bags as they load them onto a trolley.
Not that I would recommend that you do any such thing.