What is the difference between espresso & filter coffee?
The major differences between coffee beans roasted for espresso & filter is about their roasting profile. During roastering, coffee beans are usually roasted lighter / shorter in time for filter coffee, and medium for espresso coffee, darker for commercial coffee. In other words, the longer coffee beans staying inside the roastering machine, the darker it is.
The main reason for a light roast for filter coffee is because how the filter coffee is to be consumed. We usually use batch brew or cold brew to brew the filter coffee, the time that water touches coffee powder (in mins or hours) is usually much longer than espresso (usually in seconds). Therefore we need a lighter profile for filter coffee than the normal espresso. This doesn't mean that filter coffee bean cannot be served for espresso, just not as strong as it supposed to be.
By saying that, the coffee beans could usually be roasted for both espresso & filter purposes, except for certain originations like Panama Geisha or Rum which is best to be roasted for filter only.
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