Because if you keep the coffee is air. Oil type compounds with internal air potkiriya is made with beans cause stink huen and steam in the air may affect the quality of the smell reduced. Very fast, so we'd better keep the coffee in bags with valve, stop the air or vacuum materials should not be light. So if you see a coffee shop to pick out the coffee pots and glasses that show came out, making the request know that that is not the way to keep the correct coffee.
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