Nightclubs

One colour per night, the venue's logo printed, and the UV mark for the door check.

A club's real problem isn't someone getting in without paying: it's one person getting in and three bands going out the bathroom window. That's why the two mechanisms matter together: the destructive die-cut, which stops it coming off intact, and the single-use adhesive, which kills it the moment it's peeled.

Changing colour every night makes last Saturday's band worthless. Neons read best under low light and lasers; black and purple look great at themed nights but are harder to tell apart from a distance.