Why is coffee sour?

Coffee isn't inherently sour. The perception of sourness in coffee can be influenced by a number of factors:

1. Brewing Method:

* Over-extraction: When coffee grounds are brewed for too long or at too high a temperature, bitter compounds and acids are extracted, leading to a sour taste.

* Incorrect Grind Size: Too fine of a grind can lead to over-extraction and sourness.

2. Water Quality:

* High Mineral Content: Hard water with high mineral content can interfere with extraction and contribute to a sour taste.

* Chlorine: Chlorine in tap water can create a sour taste in coffee.

3. Bean Variety and Roast:

* Acidity: Some coffee beans naturally have higher acidity than others. Arabica beans tend to be more acidic than Robusta beans.

* Roast Level: Light roasts tend to be more acidic than dark roasts. This is because the roasting process reduces acidity.

4. Storage and Age:

* Stale Beans: Old or improperly stored beans can become stale and develop a sour taste.

5. Other Factors:

* Improper Cleaning: Dirty equipment can contribute to sourness.

* Personal Preference: Different people perceive sourness differently.

How to Reduce Sourness:

* Use the correct grind size and brewing time for your chosen method.

* Use filtered water with low mineral content.

* Experiment with different bean varieties and roast levels to find ones that suit your taste.

* Store your coffee beans properly in an airtight container in a cool, dark place.

Important Note: Sourness in coffee isn't always a bad thing. Some people enjoy the bright acidity in their coffee. It's all a matter of personal preference.