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. . . you could also buy some powdered grape tannin, use oak chips, or even use a cup of strong black tea to add some tannin backbone to the wine if it’d be tough for you to obtain grape skins.
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Unknown to the science at the time, these genetic mutations were first noticed hundreds of years ago in Burgundy, France, where the mutants grew side by side, and sometimes within the same plant as Pinot Noir.