Smell, 100% is not because of the problem of keeping beans, that is, not bake well. As for keeping beans, we must first understand what the keep bean is and how to keep beans.
What is the keep beans: coffee beans in the baking will have the so-called exhaust phenomenon, also said that when the coffee beans baking volume will expand, coffee beans in the expansion of space, carbon dioxide away from coffee beans. This is why coffee beans need to use the so-called one way degassing valve coffee bag reasons, because the coffee beans will be exhausted, if the bag is sealed, you will see the coffee bag bulging, or even be broken. While the one way degassing valve can be discharged from the gas, while blocking the entry of moisture and oxygen.
How to keep beans: There are a lot of talks about soybeans. For example, coffee beans placed in a one-way degassing valve aluminum foil package sealed, placed in the constant temperature of the space 4 to 24 hours. In fact, different coffee varieties have different roast ways, so the time of keeping beans do not a very clear standard. Italian coffee beans, with pressure coffee machine to produce, and you need at least 7-15 days of soybeans.
The taste is due to lack of baking, or baking uneven clip, then support is the case. Cup test has a clear requirement, to be baked in coffee beans after 8 to 24 hours.
The main purpose of the beans is to let the coffee beans exhaust, depending on the degree of baking, soy beans, the time is different. Generally speaking, the more shallow the degree of baking beans, the deeper the degree of baking the longer the bean. Generally used for the production of potatoes in the drip coffee, baking a few hours after you can drink, Italian beans need more exhaust to keep the extraction of stability, need a few days or even longer soybeans.
One way valve believes that drinking coffee should be like tasting wine, first smell the aroma, and then try a small bite, that you can taste the essence of it.