Idea:

Special edition of ‘secret bottles’, that are going to be sold in bars and clubs. 

The buyer doesn’t know if there is alcohol or alcohol free beer inside.

‘Secret bottle’ proves that Heineken taste is the same. 

Many people say that they drink because they like the taste, not because they want to get drunk. ‘Secret bottle’ eliminates the excuse..

When the bottle is taken out of the fridge, the temperature slowly starts to rise. Thermosensitive paint emerges after the bottle reaches 12ºC. When the bottle is warm enough,  the beer is probably nearly finished and the sign ‘0.0’ or ‘5,0% alc’ is visible.