Green coffee beans need to be for around 10-15 minutes and the roasting process changes the flavour of the final coffee.

绿色的咖啡豆需要烘焙10 - 15分钟，这个过程决定了咖啡最终的口感。

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Before roasting, some green coffee beans are stored for years, and experts believe that certain beans improve with age, when stored properly.

在烘焙之前，一些绿色的咖啡豆会被储藏多年，专家们相信某些咖啡豆如果储藏方法正确，它的品质会随着储藏时间的增加而提高。

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It is quite normal for a fair quality batch of green coffee (that is, coffee before roasting) to be 1-2% defective.

ECONOMIST: Espresso coffee