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We attribute sourness to under extraction, which takes place during the preparation. If coffee is under-extracted, it can create a sour sensation. (Conversely, over extracted coffee tastes bitter.) If your coffee is tasting sour, we would recommend doing one or more of the following: grind finer, a longer brew time, or hotter brewing water. That all said, if you are used to brewing only dark roasts, the fruit notes in lighter roasted coffees may be perceived as sour (tart?) to some drinkers. We would still recommend the above practices as light roasts tend to brew a little differently than dark roasts. Also check out our brew recipes and videos for more tips: https://jbccoffeeroasters.com/brew-recipes/.