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Raw bean is 12% water by mass.
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Volatile vapors cause bean to expand.
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Bean is still expanding. Acidity content higher than sugar.
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Bean at max expansion.
Balance of acids and sugars.
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More gasses are lost.
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Aromas decrease. Sugars caramelize.
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Acids radically decrease. Sugars caramelize.
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Bean loses characteristic coffee flavor.
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Bean Appearance
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Green and
smooth.
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Light brown. Smells of baking bread.
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Darker brown. Larger in size
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Bean chips begin to fly off. Smooth and brown. Oil is visible.
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Dark brown. Beans have oil on them.
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Black and oily.
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Dark black. Very oily. Burnt smell. |
Black, oil is dried off.
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