Temperature sensitive wine label
Simple, but very clever. This label develops a little blue boat when the wine is at the optimum temperature.
From Italian Wine Labels:
"The label on the Mar de Frades 2003 Albariño, a crisp, fruity white wine produced on the northwest coast of Spain that is just perfect paired with seafood, uses thermo-sensitive ink to let you know when the wine in the bottle are suitably chilled.
In fact, when the wine reaches its optimal serving temperature of 52°F to 55°F (about 11°C to 13°C), a little blue ship appears on top of the aqua waves.
The label was introduced by William Grant & Sons, importers of the Mar de Frades winery, who used it for the first time on the 2003 Allbariño wine."