
Green grapes are ordinary white table grapes — sweet, juicy and mild, with thin skins and very little tannin.
Two things arrive together here, the juice and the texture of crushed fruit, and no bottle carries the second.
Red and black grapes
Colored skins are the older form; white table grapes are the mutation that lost the pigment. Among vinifera table grapes the flavor difference is small and the color difference is not — muddled dark grapes turn a clear drink pink-gray. American varieties such as Concord are a different species and bring a strong foxy note besides.
White grape juice
Pressed and filtered, and mainstream bottlings are 100% juice with nothing added, so the sweetness sits close to the fruit’s own rather than above it. What is missing is the crushed flesh; the drink comes out thinner for it. Cordials and nectars are a different matter and do carry added sugar.
A week or two in the fridge, rinsed just before use. They fail from the stem end first, so check where the berry meets the stalk, not the far side.