These sticky caramel cups are the result of this research. Filled with milk, the caramel slowly dissolves and the milk tastes like caramel. The cups are waxed with carnauba wax, a natural, edible coating that prolongs the period until the cup starts leaking. Filled with fridge temperature liquid these cups hold up more than 50 min. With room temperature liquid the cups start leaking after 15 min leaving you with sweet, sticky fingers.