Sour is a basic flavour and therefore an easy description to understand. But do you get it when it comes to coffee? Let’s lend a hand!

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What is sour?

Sour is an overly sharp, pungent and unpleasant taste such as vinegar or acid. Sour is sometimes associated with the aroma of fermented coffee. A sour taste can be caused by overripe or already fermenting cherries or by improper fermentation, where yeast and alcohol form vinegar-like acid. To avoid this defect, coffee still in the shell is washed – immediately after fermentation when the coffee is no longer slimy and has a rough texture.


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