Why do bilberries create deeply colored liqueurs?

Expanded Explanation

Bilberries create deeply colored liqueurs because their flesh is naturally red-purple and rich in anthocyanin pigments. Unlike cultivated blueberries, which often have pale or greenish flesh inside, bilberries stain the liquid from the inside out. This gives infusions a dense ruby, violet, or dark berry tone.

During maceration, alcohol pulls these pigments from the juice, skins, and broken fruit cells. A small quantity of bilberries can color a spirit strongly, especially when the berries are ripe and lightly crushed. Lemon juice or another acidic ingredient can also make the color appear brighter and more vivid.

The deep color is one of bilberry's biggest advantages in liqueur making, but it should be balanced carefully. Too much fruit, too long an infusion, or excessive crushing can make the liquid look beautiful but taste heavy, tart, or tannic. Controlled timing keeps both color and flavor elegant.