one way degassing valve to teach you how to pick fresh coffee beans, pay attention to if the color and the size of the particles are consistent, good coffee beans have bright and shiny appearance, and with a strong aroma and not mixed into the smell. No matter what kind of coffee beans, freshness is an important factor affecting the quality.
When buying, grab one or two coffee beans in the mouth to chew, to be crisp and sound (that coffee is not moisture), teeth cheeky fragrance is the top grade, but it is best to hand squeeze, feel if it is solid, not buy brittle coffee. Such as coffee beans have lost fragrance or have a smell, it means that the coffee beans are no longer fresh, not suitable for purchase. Just fried coffee beans are not suitable for drinking immediately, should be stored for a week in order to completely release the gas inside the beans out.
In general, the best drinking period of coffee is a week after frying, the coffee beans at this time the most fresh, fragrant taste of the best performance. In addition, the purity of coffee beans is another factor, the candidates coffee, not necessarily look at the size of particles, but grasp a single product of coffee beans, about dozens of weight, take a look at each single bean Whether the color is consistent, the size of the particles, the shape is similar, so as not to buy to disguise the inferior products.
If it is integrated beans, size, color is different from the normal phenomenon. Another heavy fire and deep roasting method will cause the coffee beans out of oil, but lighter roasted beans if the oil, it has been bad, not only reduced the degree of alcohol, will appear astringent and sour.
In short, when buying coffee should pay attention to its freshness, fragrance and whether the taste, and the ideal number of purchases is half a month to drink is appropriate.