Brief: To promote 3M's purple glue stick and to establish its advantage over ordinary glue.
Solution: Purple glue is purple when you stick it and turns invisible after a few secs. Therefore it lets you see exactly where you are spreading the glue. To establish this, we will send open envelopes containing a lottery winning ticket to customers from a retail store's database. The ticket however will be already scratched by somebody before hand. A hidden side panel will reveal the product logo with the line 'see where you stick.'
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