The coffee beans most widely used in instant coffee are robusta beans: They have more caffeine content, are easier to grow (because they are pretty disease-resistant) and thus cheaper. But they also have a noticeably sour taste. Brewed coffees are usually made from arabica beans. For the beans used in brewed coffee, roasting the beans is the final production stage, and the beans are mostly used as soon as they are roasted. That’s why brewed coffee has a fresher taste. To produce instant coffee, the beans after being roasted, are brewed, and then dried by either a spraying or freezing method, which produces the soluble coffee powder of instant coffee. It’s because of this process that instant coffee doesn’t taste as fresh as its brewed counterpart.

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