
Cold black tea is a chilled infusion of fully oxidized Camellia sinensis leaves, served over ice as a non-alcoholic mixer.
Tannic and astringent with a malty, robust body; moderate bitterness and an amber-toned aroma. Purchased ready-to-drink versions are often sweetened, shifting the balance toward sugar.
Lengthening the build as a base or diluting element, it supplies most of a drink's volume along with tannic backbone and colour, and is typically topped or stirred in. Over-steeping raises tannin and astringency, so brew strength sets how far the tea dominates; unsweetened and sweetened bottled versions are not interchangeable without rebalancing sweetness.
Cold green tea can fill the same non-alcoholic lengthening role from the same plant, though its lighter colour and grassy, less astringent profile loses black tea's malty, robust oxidized character when the tea is the defining flavour.
Cold green tea
Both are chilled infusions of Camellia sinensis, but black tea is fully oxidized, giving darker colour, stronger and more robust flavour, and generally higher tannic astringency, whereas green tea is unoxidized with a lighter colour and more vegetal, grassy flavour.
Cold black tea is the same brewed black tea served chilled or over ice rather than hot, made by steeping withered, rolled, fully oxidized and dried Camellia sinensis leaves in water. The infusion carries caffeine and tannins, and full oxidation gives it a darker colour and more robust character than green, oolong, or white tea.
Brewed tea is best made fresh and kept refrigerated; it dulls in aroma over time.