All the color, aroma and taste of coffee are characterized by some chemical changes in raw coffee beans after baking.
Bitterness: caffeine, one of the basic flavor elements of coffee.
Sour taste: = tannin acid, the second basic flavor element of coffee.
Strong alcohol: strong coffee. A mellow taste.
Sweetness: when the sugar in the raw beans of coffee is partially coked after baking, the rest is sweet.
Fragrance (coffee smell): fat in raw beans of coffee. Protein. Sugars are an important source of aroma.
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